If you’re planning to publish a book you may need to do some more work on the construction of the OT canon.
The Genesis account, for which you have as coming from the Babylonian captivity, I would certainly agree that this bases as an account for humanity’s knowledge as a
terminus ad quem. This is due to the fact that Ezra had a copy of the law (TORAH)/ Penteteuch at the return of the exiles. (4thC BCE)
This however, is not the sum of our knowledge. Many scholars associate the law with the reforms of Josiah (7BCE).
Further, the existence of the tabernacle/ temple and the liturgical basis of the covenant people assumes not only a covenant but also legislation.
Thus, the most critical scholars, say in the Julius Wellhausen camp (JEDP sources) at least acknowledge a Hebrew/ Israelite provenance.
Similarities to Babylonian sources are not supprising, as you suggest, but the existence of anti-egyptian polemic in Genesis/ Exodus suggests a predating of the source material.
Enuma Elish and the Epic of Gilgamesh are both profoundly different in their theology proper and relationship between the “council of gods” and YHWH who is alone and holy.
Finally, Plato and the philosophical tradition of the greeks, From Thales (5thC BCE) to the great Athenian philosophers would not have existed to influence anyone. Plato is Aristoltles teacher, who taught Alexander the Great who you may know was 300s BCE.