What is the history of the canon of the Bible in terms of 66 or 73 books (Catholic vs. Protestant)?
Short Answer :
Their historic origins lie within the realm of Hellenistic Judaism, which, along with Judaism proper1 and Samaritanism, was one of the main subdivisions of ancient Judaism.
1 Itself divided into several other branches, such as Pharisees, ...
Actually, Jordan Bajis writes in his catechetical book, “Common Ground: An Introduction to Eastern Christianity for the American Christian” (page 93) the following:
The Orthodox Church, unlike the Roman Catholic Church, only recognized
49 books as belonging to the Old Testament canon. The Eastern Church
assigns a “second” place of honor after the New ...