If you believe there is no diety, you're an atheist.i was trying to figure out how to label myself, previous i used agnostic but apparently that means you consider knowledge of god to be unknowable. dictionary.com has "a person who denies or disbelieves the existence of a supreme being or beings" for atheist.
clueless disbelieves rather than denies, but he's still an atheist (as am i apparently.)
If you believe there is a diety, you're a theist.
If you believe cannot know whether or not there is a deity, you're agnostic.
If you believe man cannot know anything, your a skeptic.
There is never a label for people who don't take a position. All 'isms' including atheism imply a position/belief.