What many Christians fail to acknowledge is that there is a complex accumulation of evidence from many fields of thought which all taken together point us to an objectively right conclusion. Brother Apostate likes the crime evidence analogy so I would apply it here as well. Most people don't think O.J. Simpson was guilty just because of single bloody pair of ill-fitting gloves. The reason people think he is guilty is because of the weighty accumulation of all the numerous pieces of evidence and the circumstances which point to him as the most logical suspect. O.J. knew the victim, had motive, had a violent history with the victim, left his blood at the scene, left rare shoe prints, discarding his clothes, had wounds on his hand, had victim's blood on his vehicle, snuck around the back of his own house that night, acted strange, tried to run away, and many other pieces that as a whole point to him being guilty. Even if some lines of evidence went nowhere, were faked, or pointed to his innocence the vast majority of it still clearly pointed to his guilt.
Belief in God or having faith is also subject to numerous evidence lines of which evolution is but a small part. I knew nothing about evolution as my faith in God began to unravel. Evolution is just a small part of the mountain of evidence which proves to us that God is not real.There are many lines of evidence which point to the objective facts in the matter of God's reality. If the Bible is God's word then it contains many falsifying facts. The God-tantrums of the Old Testiment provide ample evidence which points us away from concluding that God is omnipotent, omniscient, and most assuridly not merciful. If God presents Himself in His own inspired book as a petty genocidal maniac then it becomes difficult to believe He would possess the wisdom and higher intelligence required to create a Universe. It certainly makes one pause to think about His qualifications to be God in the first place.
The plain fact that we have waited 2000 years for Christ's promises and yet nothing happens belies the Bible's truthfulness. The plain fact that all humans begin development as females flies in the face of a male god who creates males first in His image. The plain fact that the Universe is full of chaos and bad design including a tilted Earth being bombarded by space debris irrugularly orbiting an inconsistant Sun should tell us something. Bad biological designs such as air breathing dolphins and land animals and plants which require water to live on a planet full of deserts is another proof.
This is just a short list. The facts point to a random, cruel, unconsciuos universe and not to there being an intelligent super being like God behind it all. Otherwise the facts all contradict what we would expect to find and if this were the case, and God exists anyway, He would be quite insane considering all the lines of evidence He has given us. Finally I would say that the plain fact that God is never seen, heard, felt, or in any way makes His presence known to us should be a huge clue in of itself that He is not real.
Weigh all the acculmulated evidence and come to a logical conclusion for yourself.