A question about atheistic “beliefs” (opinions, guesses, etc.)

[Deesse23]

Wrong, again.

You cant prove a negative, thus you cant show anything to be impossible, thus everything is possible? Like the universe being created by (a god or) pink, universe farting pixies?

Nope, you have to demonstrate the actual possibility of something. "Possibility" is an active claim. If you want to make the claim that its possible that the universe was created by pink, universe farting pixies, you have to show that (pink) pixies do (possibly) exist, before you can claim its possible they can fart universes into existence.

The usual philosophical argument to combat this, is that the existence of a "creator" or "prime mover" or "first cause" is in a different category that pink pixies.

...which is a bald faced assertion