There is only ONE God. Why? Because there is only one "outside of the universe."

We have no evidence of anything in the universe making itself without something from outside of itself making it. But there is evidence and proof all over the place in countless numbers of things where they are made by something outside themselves.

This brings us to the question >>> Does anything ever make itself, from scratch, without something outside of it making it?

Another way to say this is >>> Is there ever any spontaneous generation of anything?

We have no evidence of such. Everything we know about has at least one maker. Even the idea of radioactive decay having to do with some form of spontaneity, is just an idea, but might be a theory. What it isn't is a known fact. But if it somehow could be a fact, it would be one against countless trillions of trillions of makers making things.

In other words, things have makers outside of themselves...

once something is made the maker might go inside of it...

the maker generally doesn't entirely become part of the thing that he made even if he is inside of it.

One God, not originally from within the universe He made, but partially within it now, yet also outside of it, and different than it.

Again, One God because outside-the-universe is all we know about what is outside of the universe. Outside includes not even understanding what this "outside" is or means, because we are universe oriented. One outside. That's it. One God.