the problem here is that there were No Jews Prior To The Flood, but Enoch is full of Jewish terminology...
Abram is the ninth generation after the Flood (Arpachshad is 1st post-Flood), and AbRAHam is the first Jew, by faith (evidenced by circumcision, see Rom4). Yet you'll find commentators frequently observe that the Book of Enoch was translated from Hebrew (text doesn't exist in Hebrew, but is supposedly full of Hebraisms).
Well, Hebrew didn't exist, until after the Flood.
So it's not Enoch's native tongue. There shouldn't even BE anything Jewish in the book.
Abram was the first Hebrew, the first one circumcised. His 6th-generation-back 'father' Eber (from which many think "Hebrew" is derived) -- was born 65 years after the Flood.
Are you beginning to get the impression something is amiss with this Book?
The very name "Enoch" is Hebrew, at that, because MOSES wrote the name that way.
It is really "Chanuch" or "Chanoch" (guttural soft ch sound, not "chat"room).
Name means "Dedicated", "Devoted", idea of being Totally Set On God.
"Chanukah" comes from the same root. But we don't know the original actual name for "Dedicated" in that language.
Moses is TRANSLATING, and he's getting the information Directly From God.
So any "Book of Enoch" is by definition a translation, not an original-language text.
Just the same, it shouldn't be dealing with things Jewish AT ALL.
It's all a fraud I tell you