As a programmer, I think of myself as living on logic. It's only natural then by that logic that I'm an atheist. I'm much more of a writer than a source of scientific knowledge, though, so since the logical fallacies have largely been covered, my contributions here I suspect will be largely clerical in nature.
I consider my upbringing in terms of religiosity essentially ideal. There was virtually no mention of religion at all. Nothing about whether it's true, false or even existed at all in the world. It was entirely through personal experience that I was in contact with religion. I'd say I'm a walking example of the nature side of nature vs. nurture in favour of atheism.
For those interested, I author the blog, Logic's Last Stand focused on all things logic...and whatever happens to be annoying me.