Just for the record, I think you’d have a hard time proving The Book of Enoch predates Genesis. Enoch properly belongs to a class of writing known as “pseudepigrapha” meaning it is a work that has a famous name attached to it but no actual evidence that they are the author. That being said, it is an interesting read. There is even a short quote in the Epistle of Jude in the New Testament.
I don’t have the exact details at hand, but I think the basic argument is that, since the Book of Enoch is referenced in Genesis, it must predate it.