I think "God" as a concept is the ultimate abstraction
If you keep understanding reality at more and more abstract levels, you run into a problem.
There is neither no ultimate abstract - phenomena is distinct governed by discrete abstractions. Or you abstract indefinitely and the final abstraction is what can be called God.
I'm rethinking this, I can now think of so many ways in which "God" (not a religious God, the idea of God).
But I still think this has power as an idea of God, I guess it's comparable to the illustrious "Theory of everything" so desperately (& nobly) sought by so many physicists
Unless there is infinite regress in abstraction of course