What is the importance of the Book of Enoch in the novel, Where Things Come Back?

Over the history of our civilization, many versions of the Bible have been presented. There are some that have entire sections in them that exist in none of the other Bibles in print. An example of this is given in this story where the Ethiopian Orthodox Bible contains the Book of Enoch. In this Book, the angel Gabriel, called the Left Hand of God, is sent to earth to banish the fallen angels (Grigori) to hell. God asks him to do this because the Grigori not only began teaching humans about the arts and astrology, but also begin to fall in love with some and reproduce. The humans become too smart, and too inquisitive, so God sends Gabriel to dispatch them to hell. The children, called the Nephilim are giants, and Gabriel kills them in front of their parents, making them watch.

This particular Book is the basis for Benton's religious focus, and as a result of his writing and suicide, it becomes an obsession of Cabot Searcy. Cabot discovers references to the Ethiopian Orthodox Bible in Benton Sage's journal after Benton commits suicide on Christmas. The more he reads, the more he wants to know, and the deeper he digs, the more obsessed he becomes with one of Benton's questions. What would have happened had Gabriel not been tasked with sending the Grigori to hell