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Just a word about the book of Enoch. We do not know that the Enoch that lived before the flood actually wrote that book. I believe that the quote in Jude concerning the prophecy of Enoch was actually a quote from Enoch that was known to Jude. That quote of Enoch was also in the writings that are claimed to have been written by Enoch, however that still does not mean that the book ascribed to Enoch was actually written by Enoch. Someone could have written the book ascribed to Enoch and then placed an actual quote from Enoch in order to make it appear more authentic. If Enoch wrote scripture why did not Moses include it in the scriptural writings they copied? Plus there are some ridiculous things in the book of Enoch(giants 45 feet tall).