On the contrary, the Ethiopic Book of Enoch to which you refer would make stunning cinema, it would rank with the best science fiction has to offer but would be based upon accounts found in the Dead Sea Scrolls.
Nope, not Enoch. Actual Genesis.
Genesis 6 to be precise—
the sons of God saw that the daughters of humans were beautiful, and they married any of them they chose. 3 Then the Lord said, “My Spirit will not contend with[a] humans forever, for they are mortal[b]; their days will be a hundred and twenty years.”
4 The Nephilim were on the earth in those days—and also afterward—when the sons of God went to the daughters of humans and had children by them. They were the heroes of old, men of renown.
Remember, Jesus said the end times would be like the times before Noah, so this will repeat itself. Which is why in Daniel 2:43 we read:
And whereas thou sawest iron mixed with miry clay, they shall mingle themselves with the seed of men: but they shall not cleave one to another, even as iron is not mixed with clay.
If they are not of the seed of men, then what are they? Not men.