Was the pharaoh who did away with all the Egyptian gods except for the Aton, becoming one of the world’s first monotheists.

Akhenaten

Explanation:

Akhenaten banned the worship of gods beside the Aten, including through festivals. He also declared himself to be the only one who could worship the Aten, and required that all religious devotion previously exhibited toward the gods be directed toward himself.

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must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"