The Self-Refuting Character of Atheistic and Agnostic Assertions Regarding the Existence of God: A Presuppositional Analysis

The Self-Refuting Character of Atheistic and Agnostic Assertions Regarding the Existence of God: A Presuppositional Analysis

Jack Kettler

In Christian apologetics, particularly within the presuppositional framework developed by Cornelius Van Til, unbelief is understood not merely as intellectual disagreement but as a fundamental epistemological and moral posture that opposes the self-revealing God of Scripture. This article examines two principal categories of unbelieving assertion, those claiming absolute certainty regarding the non-existence of God and those professing absolute uncertainty or agnosticism, and demonstrates that both positions are self-refuting. Such self-refutation arises because these claims presuppose the very theistic framework they seek to deny or bracket, rendering them epistemologically untenable.

Assertions of Absolute Certainty: The Atheistic Claim “There Is No God.”

Consider the assertion that God does not exist. This is a universal negative existential claim. To advance such a proposition with any degree of rational warrant, the claimant would need to possess exhaustive knowledge of all possible domains where evidence for divine existence might appear. This requirement entails the divine attributes of omniscience and omnipresence, attributes that finite human knowers neither possess nor can possess.

Because human epistemic capacities are inherently limited in scope and duration, the possibility remains that evidence for God’s existence lies beyond the inquirer’s reach. Consequently, the assertion cannot be advanced as certain knowledge. The claim is therefore epistemologically groundless.

Moreover, the assertion is self-referential and self-undermining. By denying the possibility of certain knowledge of ultimate reality, the claimant simultaneously affirms certainty about his own negative conclusion. One may therefore ask whether the claimant is certain that certainty is impossible. An affirmative response immediately contradicts the original denial of certainty; a negative response undermines the force of the original assertion. In either case, the position collapses under its own weight.

As Van Til has argued, the intelligibility of the statement “God does not exist” depends on the existence of God as the concrete universal who grounds the order, meaning, and coherence of language and reality. Without such a foundation, words lose consistent reference, and universal claims become impossible. Antitheism thus presupposes theism; one must stand on theistic ground even to formulate an effective antitheistic argument.

Assertions of Absolute Uncertainty: The Agnostic Claim “We Cannot Know Whether God Exists.”

The agnostic position, which holds that one cannot know whether God exists, initially appears modest and epistemically neutral. Upon closer examination, however, it is a substantive and far-reaching claim about the nature of ultimate reality and divine revelation. It asserts that God has not made himself known in a way that renders belief rationally obligatory for all persons. Such a claim is itself a comprehensive judgment about the knowability of God and the sufficiency of general and special revelation.

To sustain this judgment consistently, the agnostic would again require exhaustive investigation of all possible evidence, an undertaking impossible for a finite knower without divine attributes. Furthermore, the assertion “there is no certainty” about God’s existence cannot itself be held with certainty without self-contradiction. The agnostic is therefore unable to maintain the claimed neutrality or suspension of judgment.

Van Til’s analysis of agnosticism reveals its threefold self-contradiction—psychological, epistemological, and moral. Psychologically, agnosticism claims to refrain from sweeping conclusions about ultimate matters while, in fact, advancing the most comprehensive negative conclusion possible. Epistemologically, the refusal to assert anything definitive about ultimate reality rests on a definitive assertion that excludes God as sovereign over all existence. Morally, the posture of humility masks a claim to superior knowledge: the agnostic presumes to know more than the theist and even more than the theist’s God by subordinating divine revelation to bare possibility.

In each respect, agnosticism proves unable to sustain itself on its own presuppositions.

Broader Patterns of Self-Refutation in Unbelieving Discourse

These two fundamental positions exemplify a recurring pattern in modern unbelief. Numerous common assertions prove similarly self-refuting when subjected to internal critique:

·         The verificationist claim that “only knowledge that can be empirically verified is true” cannot itself be empirically verified.

·         The assertion that “there are no absolute truths” cannot be maintained as an absolute truth.

·         The relativistic claim that “all truth is relative” cannot coherently exempt itself from relativity.

·         The counsel to “be skeptical of everything” invites skepticism toward the counsel itself.

·         The moral imperative “you ought not to judge” is itself a judgment.

Such statements illustrate the inability of unbelieving thought to provide a consistent account of knowledge, truth, or moral obligation apart from the theistic presuppositions it rejects.

Van Til further observes that modern unbelieving science and philosophy demand criteria of meaning and verification while assuming the autonomy of the human mind. When pressed to demonstrate these criteria in actual experience, however, facts become indeterminate and logic loses its grounding, revealing the ultimate incoherence of autonomous epistemology.

Implications for Christian Apologetics

When unbelievers advance moral absolutes or omniscient claims within a materialistic or naturalistic framework that cannot ground them, their position becomes indefensible. The demand that Christians provide verification on unbelieving terms may likewise be set aside, for the unbeliever’s own framework is incapable of sustaining the very standards it imposes. The claim “there is no God” is, moreover, a universal negative that cannot be demonstrated by finite observation; the Socratic question “How do you know that?” exposes the assertion’s unverifiable character.

In sum, both atheistic certainty and agnostic uncertainty are self-refuting. They cannot be coherently maintained without implicitly relying on the theistic worldview they seek to undermine. Christian apologetics, therefore, is not required to meet unbelief on its own autonomous ground but may instead expose the internal inconsistency of unbelieving presuppositions, thereby commending the self-attesting truth of the triune God, who alone renders knowledge, meaning, and moral order possible.

Notes

The arguments presented draw upon the presuppositional method articulated by Cornelius Van Til, particularly his analyses of atheism and agnosticism in works such as “The Defense of the Faith” and related apologetic writings. Specific quotations are adapted from Van Til’s discussions of the self-referential incoherence of antitheistic and agnostic positions.

Declaration

“For transparency, I note that I used Grok, an AI tool developed by xAI, and Grammarly AI for editorial assistance in drafting, organizing, and refining the manuscript’s clarity and grammar, as indicated in the article’s attribution. All theological arguments, exegesis, and interpretations are my own, and I take full responsibility for the content.” –  Jack Kettler