But when it comes to the Christian faith and those tenants by which we stake our eternal salvation (such as Christ's death, burial, and resurrection), we can't have the same "absolute assurance." But why not? Of course, Mr. Koukl along with many other Christians would not view the Bible as an Axiom. Instead, it is based on believing something in light of adequate or sufficient reasons. Though i'm not suggesting that Mr. Koukl and others like him shouldn't believe in Christianity merely based on adequate reasons, I believe that Christianity is far more than reasonable, as someone like William Lane Craig would characterize it.
Consider the words of the apostle Paul:
“Christ, in whom are hidden all the treasures of wisdom and knowledge. I say this so that no one will delude you with persuasive argument…See to it that no one takes you captive through philosophy and empty deception, according to the tradition of men, according to the elementary principles of the world, rather than according to Christ.” (Colossians 2:3, 8)
If Christ is really where "all the treasures of wisdom and knowledge" are "hidden" or found, then on what basis can we place our epistemology in something else, namely, human reasoning? This is not meant to be a discussion of whether Christianity is true or false necessarily, but what your epistemological foundations should be if you are a Christian. For the Christian (and for everyone else, I would also argue, though not for the strict purpose of this blog), if your epistemology is not grounded in Christ, then you have a flawed axiom. That is, there is no biblical basis for which one begins with human reasoning and finds "adequate" reasons for believing that Christianity is true. Instead, the Bible should be your axiom, the very basis for which we can have absolute logical laws at all! For without it, you are subject to what Paul says of the pagan Gentiles, who do not worship the God of the Bible:
“So this I say, and affirm together with the Lord, that you walk no longer just as the Gentiles also walk, in the futility of their mind, being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart.” (Ephesians 4:17-18)