Research Genesis 6 a lot more.
Evidently you have a lower view of Enoch than Jesus and the Disciples did.
Some are simply not interested in ancient manuscripts which were not included in the canon or research into why they weren't included.
To each his own.
But I agree with Worldview Dad that Christians have no need to fear demons or fallen angels:
So we are back to the identity issue of the ET’s...Genesis 6 points to an increase in fallen angel/demon activity on earth and mans willingness to follow their lead, that leads to the judgment of the flood...
Matthew 24:37-39 “But as the days of Noe were, so shall also the coming of the Son of man be. For as in the days that were before the flood they were eating and drinking, marrying and given in marriage, until the day that Noe entered into the ark, and knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.”