Yes, I also got the demons thing from Heiser. (I've been to a few of his events.) I'll try to put together some references for seeing giants becoming demons.

I wonder if you've thought of Gospel of Thomas 105: "Jesus said, 'Whoever is acquainted with the father and the mother will be called the offspring of a prostitute.'"

It seems to me this is another pointer to the Jewish deity being understood as 'father and mother'. And the 'prostitute' talk points not to sexiness here on earth but some kind of cosmic crime.