The idea Jews were monotheists is a bit misleading. They recognized other gods.
The Ten Commandments say, “Thou Shalt Have No Other Gods Before Me.” It does not say you shall have no other gods, period.
A number of angles appear in the Old Testament. These were other forms of spiritual beings that existed to Jews.
There are in the OT examples of these gods becoming humans. And, there were humans who became gods. This was not altogether different than the Pagans who lived in the neighborhood. Earthly human/god combinations were all around.
The cultural setting at the time of Jesus’ life was for groupies to consider their hero a god. But, not the chief god, a lower level god like angles.
It’s common in Christianity to consider Jesus as marked to become one of the Trinity from when he was born, or, as in the Book of John, before he was born. A more accurate way of describing what went on is that he was considered one of the “entry level” gods.
This is the way the story would have ended, a lower level god forgotten by the sands of time, where is not for fortuitous events. One was the story which got started that he rose from being dead. His stock as a god went up.
This put in motion making up other stories to raise his status, the virgin birth, visits with God and all the rest.
Bart Ehrman, How Jesus Became God.