ok so do the descendants of these demonic offspring exist among us today?
There will probably be yet another outbreak of the same phenomena, the closer we get to the Lord's coming, as it will be "as the days of Noah."
And there will be a person, Antichrist, who will be the counterfeit christ, who may even claim as much as a virgin birth ; a virgin birth could be produced by Satan, with his SEED (Genesis 3:15) in a perversion of scientific method.