Although all of the books of the bible, including the Hebrew/Old Testiment have authors attributed to them, there has been no evidence that any of them were written by their supposed authors. The Greek/New Testiment was much written much after the time of the apostles, with the exception of some of the epistles attributed to Paul. All of the NT were written pseudepigraphiclly, meaning no author took the credit for the writing, and they were given someone else's name as author.
The Gospels all of which, except for Mark, were written long after the apostles had to of died. The real jest of the situation with Christianity as we now know it, is that it is not a religion started by any one named Jesus, or Yehushuha, it was really started by Paul, and his followers. One breif point of evidence is "Who wrote most of the NT?" Paul and some of his followers, Mark and luke were followers of Paul, so right there we have the attribution that it is actually a Pauleian religion. I'll post some study links and reasearch to do on this, it is quite facinating (I have them bookmarked at work).
Seedy