As it is a known fact that all the books in the New Testament that is, Mathews, Luke etc are not written by the original appostles. They were written by followers of christ upon revelations from God. so it means that these books are not written when Jesus was with his Disciples. Also record clearly stste Judas's death. I dont totslly disagree with the authenticity of the Book, but it could have been an imagination or a revelation to someone who placed their view point on Judas. If Judas had'nt died he would have been the first appostle. But since due to his suicidal death he was ignored and hated. The Truth lies with God. Anyhow the Book is worth a lot to Historians but not to Christians because the Message of Christ is not in it.