Question: why enoch is not in the bible?
Answer: The Book of Enoch was considered as scripture in the Epistle of Barnabas (16:4) and by many of the early Church Fathers, such as Athenagoras, Clement of Alexandria, Irenaeus and Tertullian, who wrote c. 200 that the Book of Enoch had been rejected by the Jews because it contained prophecies pertaining to Christ.