1. religion is capable of inventing a god that doesn’t exist.
2. Israelites needed a propaganda boost to rebel against Phoenecians, and offshoot religion helps.
3. Elders that went up to the mountaintop with Moses can unanimously be on board with Hasbara to fuel war against Phoenicians. Ends justify the lie.
4. Yaweh becomes supreme god, and Phoenicians deserve death for failing to accept all commandments. Including/especially the very weird idolatry one, that gods would typically accept as narcissistic reverence. Thou shalt kill all heretics.

Yaweh was the “subgod” for Israelites.

Yaweh was one of the sons of El in Caananite religion, which has the same Noah myth, and the religion/people is based on one of his son’s decendants. El was accepted by Greeks as the same god as Zeus. Many other Caananite polytheistic gods had Greek equivalents.

When Moses wrote the tablets, he was basically doing a religious coup to claim the Hebrew/Israelite “subgod” was the primary god. Denouncing Idolatry, and “thou shalt not covet” was also a rebelion against the main/historical Phoenecian/Caananite religion to when Israelites war against Phoenecians “do not covet their idols, destroy them”.