I was raised as a Christian, but I stepped away from the faith at I want to say 15-16 years old. Partly due to rebellious teen attitude, partly because I realised that, with all of the awful things that happen in the world, does the Christian concept of God care? It didn't seem that way, and so I became an atheist. Or I guess agnostic. I've thought a lot, and I have an idea of what I believe, but as far as I can tell it doesn't fit in with any organised religion.
Basically, I feel that if there's a deity out there somewhere, it's on the same scale to humans as we are to bacteria. That is to say that if there's a god, it's completely outside of our scope of understanding. It could be malevolent, or it could be benevolent, and we'll never know because it moves on a plane so far beyond us. Our entire planet could be a nugget of mucus from its nose, I don't know.