Jewish doctrine is absolute and unmistakeable, and has been for a long time: there is EXACTLY one God. No more, no less. YHWH is not, like Thor, one of many gods. He is not, like Zeus, the most powerful of many gods. He is the one and only god.
But no matter how hard one tries to impress that notion on a people that had once been pagan (and was STILL surrounded by pagan nations), old ways of thinking are very difficult to shake. TO use a more RECENT historical example, look at how things like Voodoo and Santeria came about:
African slaves and Native American peoples were pagans who practiced spirit religions, in the centuries before European colonialism. The Europeans who conquered the Americas imposed Christianity on the tribes they found there, and on the slaves they brought in. And, on the surface at least, it looked as if the Indians and slaves had abandoned paganism. At least, they adopted all the Christian rituals they’d been taught.
But old, long-established ways of thinking don’t go away quickly or easily. Though a monotheistic religion had been imposed on these former pagans, the Indians and slaves never fully gave up their old beliefs. Instead, they incorporated what they perceived as a new batch of gods (Jesus, the saints, the prophets) and goddesses (the Virgin Mary) into their pantheon. The end result in Haiti was Voodoo. In other places, it was Santeria and other similar practices.
Now, thousands of years from now, if alien archaeologists sifted through artifcacts from Haiti, and pieced together Voodoo relics, they might well find “evidence” that Christianity was a polytheistic religion. But that wouldn’t be accurate. Christianity is a monotheistic religion… but over the centuries, it’s constantly been infected by pagan practices, customs and attitudes.
Well, in ancient times, Judaism was in a similar bind. Moses laid down the law for his people: there is only one god, and you must not worship any others! But people who’d been pagans for centuries before Moses didn’t readily give up their old ways. Some honored YHWH while still paying homage to their old gods. Others accepted YHWH by identifying Him with another god they used to honor, and ascribing the old god’s characteristics to YHWH.
Does ANY of this mean that Jewish doctrine included multiple gods? No, not at all. But MANY Jews continued to follow pagan practices. Heck, that’s never been a secret- the Old Testament is filled with stories documenting how prophets had to battle resurgent paganism.
Did Jewish doctrine EVER teach that YHWH had a consort (a Hera to his Zeus, so to speak). No. Never. Absolutely not. But did individual Jews ever embrace pagan gods and goddesses, including one that some identified as “Mrs. Yahweh”? Entirely possible, even very likely.