i heard it was written sect or christians that were wrong...
acutally it doesnt really change the bible a whole lot...all now it says is that judas was obeying Christ and "you(Judas) will exceed all of them(other disciples). For you will sacrifice the man that clothes me."
as for the people that write it ...they were just controversial... so it was covered up
QUOTE
Unlike the accounts in the New Testament Gospels of Matthew, Mark, Luke and John, the anonymous author of the Gospel of Judas believed that Judas Iscariot alone among the 12 disciples understood the meaning of Jesus' teachings and acceded to his will. In the diversity of early Christian thought, a group known as Gnostics believed in a secret knowledge of how people could escape the prisons of their material bodies and return to the spiritual realm from which they came.
Elaine Pagels, a professor of religion at Princeton who specializes in studies of the Gnostics, said in a statement, "These discoveries are exploding the myth of a monolithic religion, and demonstrating how diverse — and fascinating — the early Christian movement really was."
The Gospel of Judas is only one of many texts discovered in the last 65 years, including the gospels of Thomas, Mary Magdalene and Philip, believed to be written by Gnostics.
The Gnostics' beliefs were often viewed by bishops and early church leaders as unorthodox, and they were frequently denounced as heretics. The discoveries of Gnostic texts have shaken up Biblical scholarship by revealing the diversity of beliefs and practices among early followers of Jesus.
quote taken from
here