It certainly challenges conventional views, but the Book of Enoch does not actually contradict anything in the Bible (it is even referenced by the apostle Jude at one point). It's a fascinating book, especially in its discussions about the origins of demons (ie they are Nephilim spirits). Often Christians think fallen angels and demons are one and the same thing, but they aren't, as the Book of Enoch explains. Anyway, great article. :)