I was raised in a Christian household and went to a non-denomination Christian elementary and a private Baptist high school, but I don't believe in any religion. I personally don't believe in the existance in God (I've always been a very analytical scientific minded person -- or, as the Christians would say, a "doubting Thomas"
).
However, I am not an atheist. I would say that I'm more like an agnostic. I cannot completely outrule the existence of God, but I have personally never experienced anything that would convince me he's there, he's never spoken to me, and - for many reasons - the existence of God does not seem logical. However, human's have been wrong so many times in history that I would never say anything absolute in regards to it.
