See when I look at ancient polytheistic pantheons you generally have some creator deity or at least an origin story (maelstrom etc). The pantheon then evolves into more gods or the other way around, some spirits are connected to world events and then unified into a pantheon.
Now what monotheism does is that it often fails at really unifying the world's happenings and structure under one 'grand being'.
Take Christianity, with which I am familiar as I was raised in a Christian family. There is a god that is in fact 3 different beings, angels, archangels, demons, a Devil and representatives for different concepts just like in polytheistic society (love, patron saints ...)
It seems to me that religions have been following the path of unification in the same way science and most other things do. The rise of communication, travel, increasing knowledge about the universe, trade etc. stimulates the idea that the universe has a unique underlying logic but just as in science we are not quite there yet.