Showing posts with label agnosticism. Show all posts
Showing posts with label agnosticism. Show all posts

Monday, February 22, 2021

An Agnostic asserts: "Humans are not random objects like asteroids." I ask, " Are you sure?"

It has been awhile. Off busy with other activities. I had typically tried to write longer entries. The following short commentary is due to a comment found on social media a couple of years ago by an avowed agnostic who stated:
"Humans can and do agree amongst themselves what constitutes acceptable behaviour for the greater good of all. That's what distinguishes us from random objects like asteroids. Individual bad people including tyrants may depart from those standards just as they may break other human laws such as relating to fraud or democratic procedures."
This assertion, typical of evolutionary atheists and agnostics, was made in the context of the issue of morality. This person was arguing for conventional morals. But, of course, conventional morals are not true morals. Conventions are arbitrary and not absolute. This is moral relativism all in all. Different strokes for different folks.

But the main point is that, in this quote, we have yet another case of the unbeliever's contradictory presuppositions of his rational freedom and freedom from the causal matrix of quantum field theory in a reality of material monism. He claims humans are not "random objects!" Is he sure? Can he prove this assertion is consistent with his metaphysical presuppositions?

He can't. It is a mere assertion and contradictory to material monism. As a bundle of material he is just a configuration of quantum fields and, ipso facto, "a random object!" On his presuppositions he actually is no different than asteroids, or any other material object in the universe. He would be nothing but a clump of matter responding to the equal and opposite reactions from other clumps of matter in the rest of the universe. The same actions and reactions that have been going on for eternity in his mythology. And, of course, none of these actions and reactions are evil, and none are good.

Monday, July 29, 2013

Varieties of Anti-theism

In the not too distant past, my favorite agnostic asserted strongly that he was not an anti-theist.  In the context of the discussion, I knew he was talking of militant atheists, such as Dawkins, Hitchens, et al., and that he was not of their ilk.

That definition of anti-theism is very narrow.  My preference is to refer to Dawkins as a "militant atheist," and reserve anti-theism for any position or thought that stands in opposition ("anti") to theism.   That is how I have used the word in my essays.

For a comprehensive survey of "anti-theism" refer to this wikipedia entry, particularly the section titled, "Opposition to the idea of God."   There, the Chambers Dictionary defines anti-theism as:  "1. doctrine antagonistic to theism; 2. 'denial' of the existence of a God; 3. opposition to God."

Within the broader definition of anti-theism in the first definition, agnosticism and even some religious positions/postures are anti-theistic.

A particular case of the latter is the concession to the "myth of neutrality" on the part of Christian "evidentialist" apologists who debate atheists on the supposed "neutral" ground of "reason" in an attempt to "reason" to a probable God.  However, to debate in that way is to presuppose that reason exists in a possibly godless reality -- that presupposition is anti-theistic.  By adopting the epistemological standards of the unbeliever, the evidentialist violates Prov. 26:4, "Answer not a fool according to his folly, lest thou also be like unto him."

Here is the late Dr. Greg Bahnsen's discussion of the "myth of neutrality":

[Greg L. Bahnsen, Van Til's Apologetic Readings and Analysis, p. 146.]
"... the epistemological disagreements between believers and unbelievers [can] not be resolved in a neutral fashion, as though the issue of God's existence and character ... [can] be treated as secondary ­ and thus temporarily set aside without any commitment one way or another ­ while abstract philosophical issues [are] debated and settled. It is often, but vainly, imagined that once we come to agreement on our epistemology, we can apply those epistemological standards to the questions of whether God exists, whether miracles occur, whether the Bible is true, etc. By contrast, Van Til taught that abstract epistemological neutrality is an illusion and that, given the kind of God revealed in the bible, imagined neutrality is actually prejudicial against God.
"If God exists and is as the Christian world view claims, then His existence has an undeniable bearing on how we understand the process of knowing, the standards of truth and evidence, ultimate authority, and other crucial matters in epistemology.
"There is no pristine, religiously neutral, abstract 'reason' to which all men first swear their allegiance, only then to turn to such secondary matters as man's nature, moral character, relation to God, destiny, etc. The kind of man who is doing the reasoning already determines something about the way in which he thinks about reason and engages in reasoning. Thus Van Til stated, 'It is impossible to speak of the intellect per se, without taking into consideration whether it is the intellect of a regenerated person or of a non-regenerated person.'
"Van Til simply called for honesty and realism here. The metaphysical situation and object of knowledge (e.g., God's existence, the relation of created things to Him), as well as the psychological/moral situation and the subject of knowledge (i.e., man as a knower, someone using reasoning ability), cannot be ignored as we develop our views of knowing. 'Reason' is simply an intellectual tool, rather than an ultimate standard of knowledge (more authoritative even than God), and as such will be affected by the regenerate or unregenerate condition of the man using it. A person's epistemological behavior and commitments are ethical in character. According to Van Til, one's theory of knowledge is not neutral, but subject to moral assessment in terms of the ultimate authority to which one submits and which one attempts to honor."

Monday, November 26, 2012

Pride and Prejudice - The Sins of Dogmatic Agnosticism

Recently, I was surprised in a conversation when an agnostic suggested that I may be suffering from the "sin of pride" in regard to my knowledge of and certain proof of the existence of God.  He expressed it something like this: "You seem to have all the answers."  The agnostic also remarked that he was more likely to listen to someone if he were more modest or humble in his assertions.  Now, I wonder if he would entertain such an attitude toward an accountant keeping track of his money.  This is an example of the agnostic's false prejudice.  He thinks that science yields knowledge --  nothing else does.  Of course, this prejudice is neither a tautology nor an empirical fact, so it is not scientific and hence, to the agnostic, not knowledge.  But it is his article of faith; totally subjective -- pure and unalloyed.

My friend's remarks betray the inconsistent and self-refuting presuppositions of dogmatic agnosticism - founded on human pride and prejudice.

The agnostic's axiom of faith (yes, agnosticism is irrational fideism) is that in the religious realm there is no truth --  or if there is, it cannot be known.  A corollary of this is that God - if there be one - is incapable of revealing himself or that he has done so incompetently (the usual and erroneous complaint is that there are contradictions in the Bible) -- and thus cannot be known.  

Agnosticism itself is a religious stance, and thus the agnostic declares his own agnosticism to be not a fact of knowledge.  He is thus a fideist, even though he maintains his agnosticism on supposed "facts."  He operates on these "facts" using the machinery of logic and the scientific method -- two abstract principles which he cannot account for or justify on his own presuppositions.  This makes him an irrationalist, too.  But such is the religion of "scientism"  that boasts of its rationality and reason!

The end result of all this is that the agnostic's skeptical religion has already made big claims about reality.   That is the prejudice.  As Cornelius Van Til has written:

". . . the point we should be most anxious to drive home is that in trying to be agnostic, and in trying to say that they have no need of metaphysics, they have already given one of the two possible answers to every question of epistemology that may be asked. They have, as a matter of fact, said that all the facts . . .  exist apart from God and are able to get along without God. They think they have said nothing at all about ultimate matters, while as a matter of fact they have in effect said everything that could be said about them, and, we believe, more beside. They have tried to be so modest that they did not dare to make a positive statement about anything ultimate, while they have made a universal negative statement about the most ultimate consideration that faces the mind of man. " (Van Til, A Survey Of Christian Epistemology) .

And as to the agnostic's supposed "humbleness" Van Til continues:

"Incidentally, we may point out that, in addition to being psychologically and epistemologically self-contradictory, the agnostic is morally self-contradictory. His contention was that he is very humble, and for that reason unwilling to pretend to know anything about ultimate matters. Yet he has by implication made a universal statement about reality. He therefore not only claims to know as much as the theist knows, but he claims to know much more. More than that, he not only claims to know much more than the theist, but he claims to know more than the theist’s God. He has boldly set bare possibility above the theist’s God and is quite willing to test the consequences of his action. It is thus that the hubris of which the Greeks spoke so much, and upon which they invoked the wrath of the gods, appears in new and seeming innocent garb."   (Van Til,  A Survey of Christian Epistemology).

Such is the agnostic's pride.

To the agnostic, it is the impersonal "unknown" that has endowed him with autonomy, thought and rationality and set him on the sovereign throne as the ultimate arbiter of everything.   Man is the measure of all things.  No matter that such things as thought and rationality would not exist in a godless reality.  The agnostic's stance is that he is the center of all things -- whether there be a God or not.   As C.S. Lewis summarized, pride is ". . . the complete anti-God state of mind." (Mere Christianity)

So, contrary to my friend's charge that the Christian who claims certitude and knowledge of God is guilty of pride, it is my friend who is guilty of pride.  In fact, his charge is absurd since God tells us that such knowledge is certain -- and God is the judge of what is pride, not the agnostic's subjective and arbitrary pronouncement.  The agnostic has no basis for the charge, nor does he realize that his charge of "sin" presupposes God.  The agnostic's charge of pride  -- having no moral justification and basis for the existence of sin -- is self-refuting and futile. 

But then. .  . all anti-theistic thought is self-contradictory and futile.


Proverbs 16:18  18 Pride goes before destruction, and an haughty spirit before a fall.

2 Corinthians 10:3-5  3 For though we walk in the flesh, we do not war after the flesh:  4 (For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)  5 Casting down imaginations, and every high thing that exalts itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;

Thursday, March 31, 2011

Remarks on Transcendental Arguments

Choosing Hats posted a link to a new web site discussing transcendental argument (TAs).  That posting, which can be found here, has prompted me to add my proverbial 2 cents to the discussion.

In reflecting on TAG (Transcendental Argument for God) and its use over the years, I have come to realize that many are unable to recognize a transcendental argument.  There are probably several reasons for this, but one reason may be that most people who have exposure to logic are reared on the classic syllogistic form. TAs are not properly syllogistic and thus cannot be written as such.  (Though syllogistic schema have been employed.)

 
Transcendental arguments have a self-reflective property.  Typically, they consist of statements for which the speaker is under pain of self contradiction when uttered.  Some perennial examples are the so-called liar's paradox: "I always lie."  That statement, if true, would necessarily be false, and so it must be false.  The person speaking such is a liar -- just not a constant one!  Another example, pronounced a few months ago by my favorite agnostic, is: "There are no answers to Big Questions." That statement is an answer to a "Big Question," and thus self-refuting.   Finally, Descartes' dictum, "I think, therefore I am" is, in my mind, more forceful when stated transcendentally as,"I don't exist" --  a blatant self-contradiction.


The above TAs I will call "first-order" transcendental arguments, since they consist of statements that are directly self-referencing and self-refuting.   This type of argument is sometimes called "retortion."   TAs were recognized as destructing the very foundations of Logical Positivism which scoffed at "metaphysical" inquiry (one should raise an eyebrow immediately) and tried to base its epistemology (without metaphysics!) on the premise that all truth is either empirical or logically derived (i.e., tautology).   All else was metaphysical nonsense. The problem, of course, is that the foundational premise of Logical Positivism is neither a tautology nor an empirical truth.  Thus, Logical Positivism is metaphysical nonsense of the very sort they decried.  

Let's consider TAG.  In a nutshell, TAG is the statement that "There is no God" is self-refuting.  This is not direct retortion since it is not directly self-refuting, but the unbeliever carries a host of beliefs that would only be true in the Christian worldview, and thus when he utters "there is no God," he should abandon any of his beliefs that are only true in Christianity.  Some examples of those beliefs would be morality, the invariant laws of logic, justice, human independence from physical determination, and so on.  The list is long.  The unbeliever's worldview is ontologically, epistemological and ethically self-contradictory.  Since the unbeliever holds to contradictory thought, his worldview is irrational.

The fact that the unbeliever adheres to belief in the concepts mentioned above is another aspect of transcendental arguments: the idea of the stolen concept.


The unbeliever rails against God using beliefs -- such as morality -- that would not exist in the atheist world.  The claim that Christianity holds to beliefs that are immoral is an old line of attack, and one which Bertrand Russell attempted in "Why I Am Not a Christian."   It is a fallacious and self-defeating argument which also has been continued by some of the "new atheists," such as Christopher Hitchens, who attempt to use the concept of "evil" to deny God.  These arguments fail because "evil" would not even exist in an atheistic world, for there would be no such thing (!). As Bahnsen pointed out against Russell's "Why I Am Not a Christian" (and which holds equally against Hitchens et al.):


     "On what basis, then, could Russell issue his moral evaluations and judgments? In terms of what view of reality and knowledge did he assume that there was anything like an objective criterion of morality by which to find Christ, Christians, and the church lacking? 

       Russell was embarrassingly arbitrary in this regard. He just took it for granted, as an unargued philosophical bias, that there was a moral standard to apply, and that he could presume to be the spokesman and judge who applies it." [Always Ready, p.156]

In fact, I recently corresponded with an agnostic who railed against God because he thought it seemed "unjust" that God would send a "good" atheist to hell.  His example was an atheist who did all sorts of "good" but only failed to believe in Christ.  That example is, of course, a specious argument since it conveniently ignores the issue of the evil acts of the hypothetical perfect atheist.  But regardless of that glaring oversight, the question that must be pressed is where does an agnostic's idea or standard of absolute "good," "evil" and "justice" come from?  There simply is no such thing in the atheistic world -- they are "stolen" concepts (or as Van Til said, "the borrowed capital of Christian theism") and thus that argument fails!


Then we have the case of Prof. William Provine, a material monist, who thinks he is "rationally" asserting that there is no human free will. Provine, as I previously pointed out, is consistent with his material monism when he reasons that human beings -- being no more than physical systems propelled by inviolable physical forces --  cannot be autonomous.  Yet, rationality presupposes freedom to be guided by violable laws of logic.   We have the picture of irrational physical forces compelling  "free" and "rational" actions -- actions that Provine has claimed are not possible!  Thus, Provine is self-refuting by way of a TA.  


I recently discovered that Epicurus stated the original transcendental refutation of Provine many years ago. Epicurus stated that one cannot rationally deny free will, since rationality (i.e., adherence to laws of logic) presupposes free will.  The argument as stated on the Internet Encyclopedia of Philosophy (
link) is:

"Transcendental arguments can be characterized as demonstrations that the skeptic’s articulation of her own position is self-defeating in some way. These arguments imply that the skeptic cannot even coherently articulate a given position. Epicurus is reported to have argued that, without free choice, one assents to propositions only because one is determined to do so. Without free choice, then, it would be impossible to rationally assent to any proposition—that is, to assent to it because one has good reasons to think it is true, rather than because one must. The proposition that one has no free choice is thus self-stultifying, in that, if true, it cannot be warranted. This reasoning implies the following argument:

    (1) I am able to rationally assent to the proposition that there is no free choice.
    (2) I could not rationally assent to any proposition if there were no free choice.
    (3) Hence, there is free choice."

"That which cannot be true, must be false," and that is exactly what atheism is!  It asserts an impossibility.  It is a world that fails ontologically, ethically, and epistemologically. It is a world without rationality, ethics, or human freedom, yet the atheist presupposes such must be.  And since atheism is impossible, then agnosticism, too, is untenable.  The agnostic should immediately abandon his skepticism regarding God, since the skeptical agnostic essentially asserts that God's existence is unknowable and, thereby, it is possible that there is no God.  We might wonder just what metaphysical law of "possibility" exists that would demand such! If the only possibilities are dictated by the physics of material monism, then one has a most baldly vicious circular argument.


We also have the skeptic.  The global skeptic claims "nothing is knowable," and as shown above, he has been summarily defeated by a first-order transcendental argument. "I don't know anything" is refuted by the unintelligibility of the utterance.  So, what we really have is the relentless unbeliever who doubts everything except the power of his autonomous reason from which he launches his skeptical attacks.  He ought to wonder why his own reason is immune (!), and if he will admit that it is not, he ought to wonder why he busies himself with his skeptical arguments against Christian theism, all the while acting as if "his" reason is the ultimate authority!  In the last case, we see another person who should shut his mouth.  The fact that he does not is a testimony to foolish pride of the agnostic's heart and his reliance on his supposed self-sufficient autonomy.


In summary, all unbelievers have a prideful, irrational adherence to the power of their own autonomy and their autonomous reason. But such autonomous rationality would not exist in a reality wherein all acts are no more than the compelled effects of ultimate irrational quantum mechanical chance events. According to the atheist, man himself is nothing more than a manifestation of that ultimate irrationality and, thereby, the metaphysical equivalent of "sock puppets."



Saturday, December 18, 2010

Inexplicable! And That's No Lie!

Every fact of human experience is proof of theism and, therefore, a disproof of atheism and, thereby, also of agnosticism. This is the transcendental argument for the existence of God -- God exists because of the impossibility of the contrary.

The other day I was pondering the slogan that some people make about our former President, "Bush lied, people died."

But what is this human act called "lying"?

First, lying requires intentionality. A lie is to knowingly utter a statement contrary to the truth in order to deceive. In this regard, the slogan above is a claim that Bush intentionally said there were WMD in Iraq, while he knew there were none.   Thus, the slogan is an extraordinary claim since most of the world's leaders and intelligence agencies believed Iraq possessed WMD. Regardless of why the nearly worldwide agreement on intelligence data was faulty, without that moral dimension, speaking or believing a falsehood is not a lie -- it is merely an error.  Otherwise, students answering examinations incorrectly are the biggest group of liars in all of creation.

Moreover, lying is a sin!  Sin is the breaking of God's commands.  But for atheists, lying could not be considered a sin, since to them, there is no God. In that case lying becomes "good" or "bad" according to situational relativism.  Of course "good" or "bad" is not absolute to the atheist -- "good" or "bad" means "good" or "bad" in terms of consequences for oneself or the conventions of one's social group.

For many of the godless, lying is a means to an end.  But this brings us to the crux of the problem for atheists.

The laws of physics have the property that they have no memory of the past and no goal for the future.  They are "ignorant" of the past and "blind" to the future (to use the usual anthropomorphizing of an insensate material universe) . The atheist worldview of materialism embodied in the laws of physics states that the future depends only upon the state of reality now.  This implies two things:
  1.   There is absolutely no teleology in physical systems -- there is no goal-orientated direction.  
  2.   The future is compelled by laws of physics channeled via irrational quantum chance.
This means that if man is purely a material system, as atheism claims, there can be no "means to an end."  And to the atheist, since man is quantum mechanically predetermined -- and his acts ultimately produced by irrational randomness -- even describing lying as a "means to an end" is inexplicable. 

It is further inexplicable that man as an absolute physically determined system can utter a false description of reality in order to deceive and attempt to alter, influence or otherwise elicit a desired response from other humans to achieve a self-centered goal.   Man's mental states, being no more than mere results of "random" quantum mechanical fluctuations, can then have no causal efficacy -- they cannot cause electrons to swerve from their paths. Mental states are to the physical brain as a person's shadow is to the body.  As a result "mental" states cannot alter physical brain states, just as the body's shadow cannot produce body motions.

"Lying" as an immoral act rests upon the presuppositions of mental causation, logical laws, human free agency, intentionality, and moral laws, none of which would exist in a purely physical reality.

The very act of lying is impossible and inexplicable in a Godless reality. So then, the human act of lying is proof of God. On the other hand, the atheist believes in things -- such as lying -- that his fundamental presuppositions deny.  Such are the contradictions of atheism and its self-refuting pretensions.

Monday, August 30, 2010

C.S. Lewis' Transcendental Argument

I am unaware if C.S. Lewis was familiar with Cornelius Van Til's apologetic work. Nevertheless, Lewis' realization of the futility of his objection to Christianity is a concise example of a transcendental critique that is at the core of the presuppositional defense of Christianity.  The transcendental critique of antiChristian philosophies is that they are all self-destructive -- and thus, there is no philosophical standoff between Christianity and antitheistic and antiChristian philosophies such as atheism, agnosticism and other religions.  C.S. Lewis saw that the presupposition of evil and injustice did not comport with his atheism, and thus his attack on Christianity was, in actuality, a fatal self-inflicted wound to his atheism.  Here is his argument in Mere Christianity:

My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. What was I comparing this universe with when I called it unjust? If the whole show was bad and senseless from A to Z, so to speak, why did I, who was supposed to be part of the show, find myself in such a violent reaction against it? A man feels wet when he falls into water, because man is not a water animal: a fish would not feel wet.  Of course I could have given up my idea of justice by saying it was nothing but a private idea of my own. But if I did that, then my argument against God collapsed too--for the argument depended on saying the world was really unjust, not simply that it did not happen to please my fancies. Thus, in the very act of trying to prove that God did not exist - in other words, that the whole of reality was senseless - I found I was forced to assume that one part of reality - namely my idea of justice - was full of sense. Consequently atheism turns out to be too simple.  If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never have known it was dark. Dark would be without meaning. [Mere Christianity, pp.38-9.]

Saturday, July 17, 2010

Authority and the "Heathen"

An agnostic friend has suggested that quoting Scripture in this blog is "preaching to the choir," and that if I really want to reach the heathen I should consider omitting it.  However, the theme of this blog is the presuppositional defense of Christianity.  Christian theism is defended as a whole, and is not a hypothesis to be established by anti-theistic and anti-Christian methodologies. Christian theism rests upon God's revelation in the Bible -- so I am perplexed as to how one can defend Christian theism without a Bible!  Would I first demonstrate the truth of the Bible based on a higher authority than God - an authority that exists independently of God, whether He exists or not?

My friend's suggestion is even more confusing given that he asserts, as do all agnostics, that there are no demonstrations or proofs of theism, or more generally that knowledge of God is not possible -- and so then, by a stronger argument, there could be no demonstrations or proofs of Christian theism.  On that view, don't quote the Bible and don't present any reasons for the defense of Christian theism, because the Bible may be false, reason is supreme and, thus, there is no defense of Christian theism.


That point of view sets up a game with a stacked deck.  How can one "reach the heathen" on such terms?  It's impossible!  On those terms, the heathen are unreachable -- by definition. Of course, the agnostic's assertion of "no proof" is itself a very huge claim about the nature of ultimate reality and of God's place (or non-place) in that reality (to be expanded at a later time).  As Van Til aptly put it, the issue is not between saying something about ultimate reality or saying nothing.  Rather, the issue is between saying one thing or saying something entirely different.  So then agnosticism, as a philosophy, is not "neutral" -- it has said everything about the type of God it might allow. And that God is emphatically not the true God of Christian theism. So much then for the supposed noble "open mindedness" of agnosticism.

You see, agnostics have an ultimate authority, too.  Agnosticism rests on the presupposition of the reliability and authority of autonomous human reason.  But when you challenge an atheist or agnostic to provide the basis for that authority, you will very likely be presented with a look of incredulity.   Some may even think you are denying logic and reason when you challenge them to provide the reasons (on the terms of their worldview) for the authority of reason. Of course Christians are not denying logic and reason.  Again, it is an issue of saying one thing or something entirely different.  On the agnostic's side we have autonomous human reason; on the Christian side we have reason as created in man's mind by God.  The latter is intelligible, the former is not.

Of course, material monism provides no basis for the existence of human reason.  In material monism -- in which all that exists is matter-in-motion evolving in time by way of random physical forces -- there is no room for human freedom.  And what is more, if there is no room for human freedom, there can be no room for free human thinking and reason, either.  So then, no matter how much Dawkins, Hitchens and others appeal to their "independent thinking" guided by the scientific method that led them to their "beliefs"  -- their "appeal"  is incredible and inexplicable.

Furthermore, material monism cannot account for human intentionality guided by adherence to abstract laws of logic/reason.  For in that view, all human "motions" are forced motions produced and determined by ultimate irreducible blind chance.  This "human reason" would have developed from a mindless and unguided universe of matter evolving by chance over time.  On that view, the material universe is mindless, purposeless, alogical, and absent of morals.  So then, materialism not only has no absolute morality and purpose (of all varieties), but it cannot even provide a basis for the existence of subjective morality and relative purpose that the atheist and agnostic alike fall back upon!

So then on the above analysis, neither atheists nor agnostics can account for the existence of reason and the scientific method that are their authorities.  A previous blog entry mentions Professor William Provine, an atheist who -- to his credit -- states openly that materialism leaves no room for human freedom.  As a typical atheist scientist who employs and  relies on the scientific method, he is an example of a walking, talking self-contradiction of atheism.  Professor Provine cannot, on one hand, be a free, independent thinker, guided by logic and the scientific method, and also be a purely and absolutely dependent physical system guided solely by mindless quantum mechanical chance. These two views are antithetical.  Materialism and physical laws are fundamentally a-teleological, while human planning and human reasoning via abstract logical principles are teleological.  Men do actions "in order to...."  Such are the internal contradictions of atheism.

Atheists and agnostics (the "heathen") are sinners in God's creation and need to be presented with their sin in all its manifestations.  Their prideful and irrational faith in autonomous reason and consequent unbelief and rejection of God is sin.  Whether they are "reached" is by grace -- and that grace comes from the God of the Bible.  So then, there are two issues at work here.  There is the apologetic task and there is evangelism -- both require the Bible.  It is true that in the course of the apologetic task, evangelism may also occur, but conviction and conversion are in the hands of God.

Should I not quote Scripture to defend the truth of Christian theism, and should I not quote Scripture to reach the heathen? What does God say?

"So then faith comes by hearing and hearing by the Word of God."  Romans 10:17.