It must be tough being a presuppositional apologist, for the quandary which haunts his vocation is never ending. On the one hand, he is under pressure to characterize his god as so fundamental and ever-present that only its existence could serve as man’s supreme epistemological axiom. On the other, given the fact that we have no direct awareness of anything that answers to the descriptions attributed to “God” or “the Lord,” the apologist cannot avoid the need to claim to be in possession of some kind of argument which compellingly establishes the conclusion, “therefore, God exists.”
These two horns which the apologist must somehow balance are mutually exclusive. An axiom identifies a fundamental fact which is perceptually self-evident. We do not need to prove that which is perceptually self-evident, while the purpose of an argument is not to establish the truth of facts which we directly perceive, but to make explicit the inferential steps leading from a truth which is perceptually self-evident to a truth which is not self-evident. It is always in the convoluted tangle of the apologist’s attempt to outline such an inferential sequence that the apologist’s argumentative efforts break down. But just by assembling an argument in the first place, the apologist is tacitly conceding the fact that his god-belief in fact does not have the fundamental status he claims it has.
The purpose of presuppositionalism as an apologetic method seems to be to play these two mutually exclusive horns while pretending that there is no dissonance between them at all.