Originally Posted by radix
I do not lack belief, as belief is not relevant to the question of the existence of god. I do not have belief in a god, as believe is irrelevant once again. I believe there could be a god. I also believe there could not be a god. In other words, I believe, and I lack belief, in the possibility of a god simultaneously. It could be there is a god, and it could be that there isn't. I simply don't know the answer, and I believe it to be unknowable, so I don't consider the question.
An agnostic atheist would say "I don't believe in a god, but I can't be sure". I say "I simply don't know.". There is a difference.
Well, I decided to ask some people who know more about this than I do.
I can't say it any better than this guy, so I'll just link you to the post.