I think we'll see mostly atheist followed by Christian if we end up with a decent amount of Hubskers (or whatever we're called) answering. I say atheists at top because they tend to be over-represented online relative to in meat-space. I'm an (agnostic) atheist myself. I have some interest in non-theistic Satanism, but wouldn't consider myself part of it.
I'm agnostic as well, but can't reconcile agnosticism with atheism. Atheism is a certainty of the absence of god(s); Agnosticism implies it's futile to declare certainty one way or the other, as we lack the insight to definitively know. That's how I understand it, at least.
Agnostic is the opposite of gnostic, and deals with knowledge rather than faith. Gnostic atheist would be certain that no gods exist. Agnostic atheist is I don't think there is enough knowledge to say for sure, but I don't believe in a god. Agnostic by itself is also used, I don't like this as it's definition is trying to force atheist to mean something that most atheists don't agree with by calling it a belief in the lack of god rather than just the lack of belief in a god.