Well, technically I'm agnostic, since I acknowledge the possibility my beliefs could be wrong (although I'm doubtful). But more accurately put, I just don't subscribe to mainstream religion. I believe in a higher power and even in "life after death" but I'm not going to live my life according to a "little" book that a couple of old monks wrote.
I think I called myself "agnostic-theist" in that old religion thread in D&D.