Is there only one God?
It would seem to many of the Ancients, gods were what we would call metaphors, or ideals today. Those conceptual memes our minds gravitate towards and between.
Basically as the process of cognitive evolution. Gods of war, love, beauty, seas, desires, even gods of wine and pleasure
In this world, monotheism was a monoculture. One people, one rule, one god. The community as a whole, larger than the sum of its parts.
For millions of years, humanity functioned as these social units, aka, tribes. Where one's status was a function of what one added, not what one extracted.
Where responsibilities preceded rights.
Yet as the numbers increased, these tribal units found themselves interacting with other tribes.
It would seem that if one tribe believed its god was the only true god, it wouldn't be able to get along with other tribes. There would always only be Angles and Saxons, never Anglo-Saxons.
Yet as even galaxies trade light and energy around, so too did these tribes have to network around their differences.
Just as with individuals, there is that interplay between cooperation and competition.
When it all becomes about competition, then eventually everything collapses. All against all.