So, you call Atheism a belief system? It is not.
Ok, well, I will humor you. If atheism is to be thought of as a belief system as religionists like to think, then it’s the confirmation of two philosophies, Rationalism (reason) and Empiricism (evidence), in simple terms, it’s the method of only accepting valid as well as reliable reason and evidence. Since god hypothesis claims fail to substantiate with any “evidence” as well as are exposed to contain thinking errors, logical fallacies, and internal contradictions, it has no warrant nor justification to support “reason” believing it to be in any way true. Thus, to your belief that Atheism is a belief, but you have it backward, we have credible belief systems that lead us to the conclusion of Atheism, which is stating I do not have a belief in gods, which because of the facts in evidence is the only rational choice.