I’d really like this thread to be a discussion about what sort of religion most of mankind originally held in ancient times -— monotheism or polytheism.
I would think that it would be clear, absolutely so, that when Adam and Eve were in the Garden of Eden that they didn't think in terms of "religion" but in terms of "reality" and they knew that there was only one God, "in reality".
It was later on as men rebelled against God and also as their rebellions produced lies and "religions" to compete against the "reality" of the One God, that you have all the resulting confusion in the world.
As the Bible says, Satan is the father of lies and it's in his own interest to tell all sorts of lies about "diety" and to invent competing "religions"... :-)
The rebelling against god seems to me to have started with eve and the serpent. There was something there even before that or the serpent wouldn’t have had any success.