Arguments against existence of God.

[Bucky Ball]

So what it's immaterial

Bingo! It's not a determining factor.  They could all be chickens, and it wouldn't hold any relevance because the study of cosmology isn't bound by their religion (or being a farm animal), and neither are their findings.  Atheism is an opinion and a religion, nothing more.  I can believe its constructs for whatever reason I choose and call myself an "atheist" or not believe them at all, and still be considered an "atheist." At the end of the day, it's just an opinion about "god(s) vs no god."

You can't possibly be serious.
But thanks for disparaging religions.

Atheism is nothing but the ABSENCE of 1 thing.
A-theism. No theism. No theism.
It's nothing more than that.
Just like :
a-symmetry ... no symmetry, absence of symmetry
a-symptomatic ... no symptoms, absence of symptoms

Dismissing as preposterous the claims and notions of theists, is nothing more.
They do not merit consideration. At all. They're nothing more than the anachronistic meme's of long bygone eras.
That's hardly "religion" by any definition.