Atheism is the lack of a belief. Atheism doesn't say anything about explaining things. Atheists just don't think the claims of theists are believable.
That's not a set of beliefs.
evolution has nothing to do with atheism.
So you're saying atheist live their life with no belief in a god? Well that's
the definition of an atheist. They have no belief in a god.
So? Nothing in atheism makes this a requirement unlike christianity.
There are no set of rules to being an atheist.
So if you don't believe aliens exist it's a religion?