I'm off site today, so only a short moment to put a thought.
If there was irrefutable, and physical/tangible and undeniable proof of God, would you really have a "choice" in believing?
Much of the religious doctrine regardless of "god" (christain, muslim, etc) centers around man's choice/free will; and that we're too limited to understand god's reasons.
many people have too large of an ego to humble themselves to that possibility.
one of the things that led me down the path towards belief/faith aside from the statistically rediculous odds of it all being "chance" is that I'm equally uncomfortable believing that my thoughts, feelings and emotions are all just a bunch of chemical reactions - or that I'm just a part of the "matrix".