Technos

My first reason? Hmm, well I've never been a theist so it's hard for me to say. I believe that most people are taught or "trained" to believe, if not by their parents then by the culture they live in, so in my case my first reason may well be that I wasn't taught to believe in any deity, and was exposed to several cultures as a child. Maybe the fact that my mother's a former Hindu (now agnostic) and my father's an Atheist has something to do with it

mongrel

My original reasoning was pretty well summed up by tronvillain. When I looked at theism as a 9-10 year old, I found questions which couldn't be answered, making religion look like a con. I think being brought up to question things, rather than accept everything blindly, made it easier for me to remain an atheist(as I was born one).