I'm an atheist
I don't use weasel psuedonyms like "sceptic", "secular humanist" (although I am both of these) - I call myself an atheist because I'm not ashamed of the label, or scared of what people might say about me if I use it. I know people are different in america in contrast with the UK, but wherever you are, unless there is some kind of legal sanction, you shoul never conceal the fact that you don't believe in god.