OK, so I'm an atheist, but one who believes there is no god, but has that as a tenet of faith that says it can't be proved. I think that's probably the crossover; by your definition, the difference between an atheist and an Agnostic is miniscule, which is why Dawkins and Scalzi are Agnostics but I can't argue with their position as it sounds like mine.

Meh, it matters not in the greater scheme, none of us delude ourselves into thinking some higher power is there to assist us...

BTW, your icon, I've liked it for ages, but I forget where it's from?