I do not understand how people CANNOT believe in God
That is because you blindly accept dogma without question and dismiss, compartmentalize, or rationalize any and all things that conflict or refute whatever dogmatic religion you adhere to. However, you're lack of understanding on the subject of atheism is not in any way evidence that your "god", or any "god" exists. It is only evidence of your lack of rational and evidence based line thought.
There seems to be an overwhelming amount of evidence.
Like what? Outside of the bible name for me 1 thing, 1 single little thing that in and of itself points directly to the existence of the christian "god".
Bible is not only just a religious book that forms the basis of the entire Christian religion
The bible is, at it's very best it's unsupportable hearsay, and at worst, and most likely, a work of fiction with a few historical names thrown in for credibility. It's wrought with contradictions and falsehoods, it's authorship is largely unknown and not literally consistent as one would expect a "divinly inspired" book to be.
it is also a book of HISTORY
Is there history in the bible? Yes. Is it an accurate and unimpeachable authority on historical events? Not in the bloody slightest. The vast majority of "history" in the bible is either lacking any and all archeological evidence that would certainly have been left behind, or it's simply not possible under the laws that govern our reality, requiring a "god" to not only initiate and micro-manage the event, but to also to conveniently magic away any and all evidence that the supposed event ever took place.
Denying there is a God is like denying the Holocaust ever happened.
No, it is not. There are thousands of eye witness accounts, and thousands more that were unfortunate enough to have lived through it. There is photographic, audio, video, and written evidence that attests to the reality of the Holocaust. Whereas your "god" has only aneccdotal accounts with nothing in the way of concrete facts or evidence. There is not a single claim about your "god" that can be tested or proven.