I'll stick with labeling myself as a Strong Agnostic. It makes a much stronger claim than Atheism does and it requires no leaps of faith.
To save ya'll the Google trip:
Strong agnosticism (also called "hard", "closed", "strict", or "permanent agnosticism")
The view that the question of the existence or nonexistence of a deity or deities, and the nature of ultimate reality is unknowable by reason of our natural inability to verify any experience with anything but another subjective experience. A strong agnostic would say, "I cannot know whether a deity exists or not, and neither can you."