God is the thing that came before everything. The prime mover.
Whether it’s an actual entity, or the human inability to conceive of nothing before something, this is still a fine concept of God.
The fact that “infinity” and “nothing-before-something” cannot be lived, or experientially felt is proof of the existence of “something more”.
I imagine we will never have an answer to the question of “God”.
These are black box concepts that we made up to describe the ineffable. They go beyond human experience.
Whether or not it exists is besides the point. Even super intelligence will not have a satisfying answer because it will exist in this Universe. There is no data on what came before.
And eventually, the Universe ends, in max entropy. So even super intelligence will come to an end in this Universe. It will die, and not be able to experience infinity.