So since this is the Atheist Nexus I'm going to asume everyone is Non-Theist.
Personally god never held much appeal to me, even though both my parents are Christain. When I was younger I'd always sit down and read the bible, of corse it never made much sense. But I saw it as what I was supposed to do, it was more of a chore than real belief. So when I got to the point where I could comprehend what I was reading religion seemed trivial and inconsistent.
I was confused at how a god who was supposably the picture of moral values and humanity could send his son into the world with the intent to be killed. Not to mention that if you don't devote your whole life to him it's straight to hell with you! From then on my doubts started to double and triple until I came to the conclusion that Theisim is B.S.