Why did we stop inventing gods?

[Arkilogue]

Representation (in story form) as an extant, living, eternal infinite. That some kind of vibration started creation, usually described as a "Word" or self expression. Representation of the story of the "Savior Son of God born from a virgin" in many cultural mythos. The further back you go, the simpler and more symbolic the story is, the further in time forward that more anthropomorphized it has become.

That explains how one set of religion has stopped progressing. That doesn't explain others though. The question was about new gods, not the assertions of religious ideas that already existed.

That being said, I'm not entirely convinced that I agree with the original question. I won't get into that right now though.

Well then in ecological terms, I would say the the current forms of religion have filled all available niches and there is little to no room for less competitive forms....till a stronger one comes along.