Demons are not the Fallen rather all the spirits of the Nephilim who were killed. They are an abomination to God. All Fallen Ones who mated with women of earth are enchained in Hell until Judgement Day.
2 Peter : 2: 4
2 Peter 2:4
“For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment;” So Posidon , Who made Atlantis and claimed to be a God but was a Fallen Angel is enchained in Hell until Judgement Day.
Numbers 13:31-33
31 But the men who had gone up with him said, “We can’t attack those people; they are stronger than we are.” 32 And they spread among the Israelites a bad report about the land they had explored. They said, “The land we explored devours those living in it. All the people we saw there are of great size. 33 We saw the Nephilim there (the descendants of Anak , Decendents of ( Anannaki ) come from the Nephilim.

https://youtu.be/ZV-lU51d-...