Interesting quotes from the AP article:
Religious and lay readers alike will debate the meaning and truth of the manuscript. But it does show the diversity of beliefs in early Christianity, said Marvin Meyer, professor of Bible studies at Chapman University in Orange, Calif. The text, in the Coptic language, was dated to about the year 300 and is a copy of an earlier Greek version. A "Gospel of Judas" was first mentioned around A.D. 180 by Bishop Irenaeus of Lyon, in what is now France. The bishop denounced the manuscript as heresy because it differed from mainstream Christianity. The actual text had been thought lost until this discovery. Elaine Pagels, a professor of religion at Princeton University, said, "The people who loved, circulated and wrote down these gospels did not think they were heretics."
Christianity in the ancient world was much more diverse than it is now, with a number of gospels circulating in addition to the four that were finally collected into the New Testament, noted Bart Ehrman, chairman of religious studies at the University of North Carolina. Eventually, one point of view prevailed, and the others were declared heresy, he said, including the Gnostics who believed that salvation depended on secret knowledge that Jesus imparted, particularly to Judas.