The "Old Testament" had to be recreated from memory when the Jews were released from Babylon .
The books that compose the "Bible" were selected by the early Catholic Church, it includes 4 Gospels, or eyewitness accounts, however they were not put to paper until decades after the events described.
The Vatican archives contain more than 80 "gospels" some of those were written within days of the events.
The "New Testament" contains a number of letters written to various churches through out the middle East, they were chosen to serve the purposes of the Church, not necessarily Christianity.
At the time King James paid to have his version of the Bible compiled there were dozens of versions of the Bible containing a varied assortment of books, the currently used version was compiled to serve the Purposes of a Catholic English King, again, not necessarily the purposes of Christianity.
The most reliable information on the life and teachings of Christ are not in the Bible, which is in fact very unreliable, but in the Vatican archives since they have retained original source materials as far back as the writings of Peter.