"atheism" is a stupid idea. "atheist" is a stupid title.
i do not believe in flying purple people eaters. nobody calls me an "a-flyingpurplepeopleeater-ist".
i do not believe 2 + 2 = 7. what's my title for that? do i get to claim an "-ism" for it?
i am not an "atheist".
i'd guess there are words for those who Do believe that 2 + 2 = 5, or that magicky dudes walk on water and are made of bread (with 17% alcohol by volume wine for blood, no less!), or that they're Napoleon, but i took abnormal psychology almost 20 years ago, and i don't remember.
if i Must have a title, please call me "not insane".