you don't need to, obviously but that's why i am an agnostic and not an atheist because to call myself an atheist i would need toI'm an atheist. My only knowledge pertaining to this is that I lack a belief in "God". Why would I need extraordinary evidence to show that?
i have no problem with people calling themselves atheists - i have a problem with people calling me an atheist
if that were to be put into one category i'd be fine with atheists & agnostics but not with atheists