How far reaching are God's powers?

[Gwaithmir]

What is God god of? My guess is that most believers believe that God's powers go over our solar system. So is the God a God of the whole galaxy or just part of the galaxy? Does it go beyond galaxy and God is God of the whole galactic cluster? Or the believers believe that God is in charge of all the galaxies? I mean that is a lot of galaxies, stars, planets, and whatnot.

And if God is God of the whole universe is it just this universe or is he God of all other universes, or each universe has its own God?

Psalm 82 mentions how God has meetings with other gods so we see some division of power, perhaps gods of other galaxies or universes?

I think, and according to God's description, God created everything, and everything means literally everything, which includes math.
Saying Gods (plural) mean nothing since God created math in the first place.
Also, saying that God has power means nothing since he created power in the first place.
Saying that someone created him also means nothing for the same reason.
God should be described as the one who created everything, no matter what your mind can dive deep into.
God should be only described as whoever created everything, and that is it.

Please describe the mechanism by which God allegedly created everything ex nihilo.