How many of the 66 books were in the bible before Christ? Caution trick question?
There aren't 66 books in the Bible.
The Holy Torah (Genesis, Exodus, Leviticus, Numbers, and Deuteronomy) was written entirely by G-d and actually pre-existed the world. It is the Supreme Revelation which judges all other claimants.
The nineteen other books of the TaNa"KH were added by the 'Anshei HaKenesset HaGedolah before the chrstian era.
The TaNa"KH is a Jewish book which has been appropriated by chrstians.