I'm not an atheist, but I don't call myself a catholic, baptist, lutheran or anything like that. I also do not attend church (I think I may have been to one a total of four times), and I have never read the bible.
I'm not a very good christian by most people's standards, but I am one nonetheless.
My mother is a baptist, my father is a catholic, and my brother is an atheist. They don't get along so well, and I'm just stuck somewhere in between.