That is a critically important question, since there are many today who would deny that these 66 books truly make up the complete canon of Scripture.
The Roman Catholic Church, for example, claims that the Apocryphal books which were written during the inter-testamental period (between the Old and New Testaments) ought to be included in the Bible. Cult groups like the Mormons want to add their own books to the Bible—like the Book of Mormon, The Doctrines and Covenants, and The Pearl of Great Price. And then there are popular books and movies, like The Da Vinci Code, that claim centuries after these books were written Christians (like Constantine) determined what was in the Bible.
