At first glance it might appear that the move from fundamentalism to atheism is a tremendous leap of faith, but this may not necessarily be so. Fundamentalism and atheism are two sides of the same thin empiricist coin.
I referred to this blog tonight while having a great conversation with a friend. Faith isn't knowing; faith is trusting; it's being persuaded. I don't believe that anyone has ever been converted by a factual argument; people follow Jesus as a result of an experience with Jesus. The evidence, as it were, is what Jesus said to Nicodemus: "The wind blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit."