Revelation 2:9 ‘I know your tribulation and poverty—but you are rich—and the blasphemy by those who call themselves Jews and really are not, but they are a synagogue of Satan.
Revelation 3:9 Look! I will make those from the synagogue of Satan who say they are Jews yet are not, but are lying—look! I will make them come and bow before your feet and make them know that I have loved you.
To be taken with a grain o' salt, because I ain't no kind o' scholar, so...
Before the Khazarians it was the Edomites. Edom. The people there in were worshipers of a handful of demons pretending to be gods, among those, Baal.
Eventually, Judea conquered Edom and forced them to convert. It is believed by some that this is when the Pharisees gained in popularity and power. The practice of making religious observance a show and treat it as a source of income to be taken by hook or by crook from the general populace. All to cover what was practiced in the quiet of the home and the safety of secret gatherings. Israel didn't keep falling to the practice of Baal worship on accident. It was an inside job.
Then, when the great dispora was kicked off, it was that subgroup that fled east and eventually settled in among the Khazars.
But, I could be wrong in small or large bits.
Plausible. I'll allow it.