There's nothing to confirm. You're making a mistake common among theists: assuming that atheists believe there are no gods. Some might, but that's not part of atheism. Atheism isn't a belief, it's a lack of belief.And you are only able to confirm your belief by arguing against the beliefs of others, right?I don't believe it is possible for atheism to ever be anything more than critical theory because there is no affirmative case for atheism. The only argument of atheism is to argue against religion and to criticize religion.
So my question is... Is it possible for atheism to ever be anything more than critical theory?
Atheism is simply a statement of a lack of belief in any deity. Nothing more and nothing less.
That there is no actual proof of the existence of any deity means that all religious belief is theory.
Let me ask you this - Do you believe in all gods, or just one? If there are gods you don't believe in, do you feel the need to argue against every god you don't believe in? Do you have to confirm your lack of belief in all other gods? Each and every one? Or is it enough to just say, "I don't share that belief"?