Even in the movie, they explain what happened. Like when Yahism took over Israel, it was after this scene with Moses receiving the ten commandments (Torah = "Instruction", "Teaching" or "Law") as tradition literally tells us, but we still say God wrote the whole bible or maybe even say God influenced or inspired the bible. There were times when the people did something else than their teachings. In this scene we repeat the same scene over and over again in the tradition of the bible for example the reign of Solomon who was labeled Jedidiah (Jedi) which means 'Beloved of God' by the prophet and speaker of God Nathan, also fell from grace so to speak when he decided to appease his wives that were from foreign cultures. Again in the book of Hosea that explains the jews returning from exile from Babylon took foreign wives and had children that were not favored by the God of the bible. This is after what happened with Solomon and after what happened with Moses at the foot of the mountain of God.
Repetition. Cycles of history. Rhyming of history. However you want to put it, we are going around in circles.