What people seem to forget is that every religious book there is, the Old Testament, or New Testament, the Qur'an, etc. they were all written by people!!!
Not one word in the bible was written by Jesus himself.
That's why the Catholic Bible has 72 Books, the Protestant Bible contains 66 books & the Old Testaments has 45 Books.
Yet they are all called The Bible.
There are also other books like the Apocrypha including the book of Enoch which are not recognized by some Historians.