This is definitely an interesting question you have here. Simple, but interesting.
...my God. I'm a strong christain; which, of course, creates an image out of me that shows some fat girl in a floral dress going around with a bible in hand. Which is sad, really; because God deserves much more credit than that.
We all have mixed views, but I do believe that God created the Earth and everything in it. I don't think we grew from monkeys, from my own observations (but I won't go into that here). I also believe in miracles, since I've seen many for myself. Sometimes they're as little as praying with your family for a sore throat to go away, and it does just after you're done praying to something as complex as lifting a demon from a person's body.
I think the greatest cause of aetheism is because either they are severely left-brained (logical in thinking), or feel they don't want to take responsibility for certain actions. If you're an aethiest, then you can go get drunk or fornicate without feeling bad at all. But if you're a christain, catholic or any other religion; if you commit sins, you are guilty of them. Which, ultimately, can lead to passage to hell (if you believe in that.)
As for proof right now, I'd have to write a lot. If you'd like me to provide written and documented proof to a certain topic, please, reply to this and ask me. Let me forewarn you, however; some things can not be proven.
What use is feeling bad if you are going to sin anyway, at least atheists are honest about not caring, although I challenge you to go out and get pounded and tell me you don't feel bad the next day!!! :P