Was watching a PBS documentary on the Bible, specifically the Old Testament, otherwise known as the Torah, otherwise known as the Jewish Bible. They discussed the origins of monotheism coming from a strain of Canaanite polytheistic religion that King David consolidated into monotheism around 1,000 BC, if I recall correctly.
Politically speaking, the idea of one God for one Jewish nation ruled by one ruler would have made sense from David's perspective. A unitary state and a unitary God are consonant.
Naturally, Christianity and Islam are branched of this monotheistic religious tradition. And for centuries, they have predominated and will probably continue to do so for some time.
But as I've become more interested in "paganism", I find myself wondering if it won't see a revival in the coming years. Much of the theology surrounding the monotheistic religions is seen by many as inconsistent with science, so they have a hard time accepting it except as myths and the like.
Not that pagan religions are any less mythological, but modern practitioners of pagan religion are more inclined to acknowledge the mythological nature of their respective pantheons, whereas monotheistic orthodoxy tends to emphasize the literal nature of their theology.
There are several other reasons why I believe pagan religion will see a revival, but I will leave it at that for now. Just wanted to get some thoughts down to serve as a basis for discussion.