What do you believe in?

[Welsh cake]

Because I feel like it. And I'm not a sap. But I do know a few saps.

You have no valid reason or justification for your beliefs then. How you feel about reality is irrelevant and irrational if you allow that to dictate what you claim to know or understand about the real world. What I feel has no bearing on what is actually demonstrably real.

I should think there's a lot of arguing amongst atheists in that case. And a lot of snobbery. Not a very unified or effective group at all. No wonder you don't get anything done.

Because we care about epistemology, truth, empiricism, what has proven to exist/manifest and so on, and reject what cannot stand up to moderate scrutiny, examination and investigation as utter nonsense, unlike you.