In a traditional polytheistic cosmology, there's no need for a worldview to be systematic. Each god may have unique powers that are not necessarily consistent with those of another god. However, once we conceive of a sole creative power in the universe, the gods that previously represented natural forces and creatures are no longer the source of divinity. They become mere recipients of the creative force of the one god; they are now just intermediaries between the one transcendent god and ordinary human beings.
the problem with monotheism
