You really do not get the point. Atheism does only mean to not believe in a single, almighty God.

I have no problem accepting powerful aliens, extradimensional beings, or unimaginable creatures. As long as they can be proven not to be hallucinations.

Whatever they are, they are not God, because God is some contradictory being thought up by people, conjured out of nothing, without relatives or ancestors. Religions based on such concepts are nonsensical in the least.

The stories are inconsistent; the whole concept is ridiculous. No matter what comes down, I will not believe. Atheism is not a religion.

I could accept religions being wrong, and that people mistakenly declared some alien to be God, and invented ridiculous stories around the concept.