Atheism is the rejection of an assertion that there is a god or gods. If any theists were able to prove the existence of a god, an atheist would (hopefully) change their mind. Rejecting all gods until their existence can be proven is hardly inconsistent.

I reject as true books that say the X-Men exist. Those are first hand sources, but that does not mean the stories they contain are true, even though they are more morally consistent than most popular religious texts. I have not read the X-Men but that is no reason to assume they are true.

Extraordinary assertions such as a devine being existing require extraordinary proof. No religions have managed to provide more than heresay, anecdotal evidence, and assumption to support their claoms. Religious reasoning is as best motivated, and hardly consistent itself.

My opinion is based on how world religions are used by their followers and those in power. All I see is religion used as a tools to control, intimidate, otherise, and war with any group considered "not us" - no matter the religion. I have read summaries of the Bible, Quaran, and Book of Mormon. There is nothing of note in any of them. Any possible good advice or dictate has long since been rephrased, refined, and adopted by society. The beauty of a thing is in its utility, and the use I see religion put to buy those in power is ugly. I want nothing to do with poisonous dogma, and instead choose to try making life better for those around me by direct action. Not by wishing for a god to do so, or wasting this precious life gambling that their might be something better after it ends.