If an all-powerful God exists, then there can only be one all-powerful God.

If a god does not know all things then that god is not the all-powerful God.

A god cannot know all things unless that god has all of the same experiences as all things.

A god cannot have all of the same experiences as all things unless that god IS all things.

Only all things has all of the same experiences as all things, therefore ALL THINGS is the one all-powerful  God.