“No theist can prove the existence of God,” asserts the atheist. But the atheist’s own philosophy doesn’t fare any better: no atheist can prove that God does not exist. When an atheist points out logical inconsistencies, fallacies, faulty arguments, etc., in the theistic approach (and may or may not be correct in so doing), he has still not moved the ball down field one bit toward the goal of proving the non-existence of God. The trouble is, the same criteria demanded of the theist by the atheist must also be demanded by the atheist himself. If it is indeed true that some theistic arguments are unconvincing, one may say only that they are not convinced, not that the point of the arguments have been settled by their lack of success. A person can have a correct position on a subject without being able to correctly argue that position. The truth of the matter stands whether or not it is argued well.
So, for example, the arguments of theodicy against theism are irrelevant (that is, if God exists, why is there evil? Evil exists, therefore there is no God; to put it too briefly). Arguing against an unpleasant deity are not arguments against that deity’s existence. That is to say, one may be angry with God, but in matters of existence it is irrelevant.
The atheist will never allow an argument to prevail, nor evidence to convince. He must, as a precondition to his atheism, deny God’s existence:
Romans 1:18–23 (ESV)
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. 19 For what can be known about God is plain to them, because God has shown it to them. 20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. 21 For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. 22 Claiming to be wise, they became fools, 23 and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.
The theist and the atheist both must start with God: the theist presupposes God as the only possible explanation of anything, and the atheist in a presupposed denial. The Christian theist sees this; the atheist is blind to it. It should be remembered, however, that both the theist and the atheist know there is a God.