We know an Egyptian came up with it ~ and the Egyptians later did their darndest to hide the idea from us.
Akhen-aten came up with monotheism as part of his campaign to break the power of the Egyptian priests; he didn’t abandon his entire social system and social status as an act of faith in the One True God who revealed himself to him.
The story of Abraham is subversive of the world in a way that a Pharaoah’s cult of personality could never be.