Its basic tenet is that there is no higher authority in the Universe than Mankind. That suppositional belief is inherently no more or less valid than "traditional" religious beliefs in a superior being or beings who control/affect human destiny. Inasmuch as we are, definitionally, unable to comprehend an intelligence greater than our own, there is no way of "proving" either proposition. Therefore, atheism should be given no more or less consideration than other religions.