If God's existence is so self evident as the christian proclaims, then why on earth have oceans of ink been spilled trying to prove this being? Link.
Let me put a finer point on this: If the God of evangelical Christianity exists then why isn't it more obvious to others that he does? Do evangelicals who travel the country and the world even bother thinking about this as they see non-evangelicals everywhere?
[Edit: That's non-evangelicals. Everyone who is not an evangelical is a non-evangelical for the logically impaired].