Karen L. King, a professor of the history of early Christianity at Harvard Divinity School, and an expert in Gnosticism who has not yet read the manuscript released today, said that the Gospel of Judas may well reflect the kinds of debates that arose in the second and third century among Christians.

"You can see how early Christians could say, if Jesus's death was all part of God's plan, then Judas's betrayal was part of God's plan," said Ms. King, the author of several books on Gnostic texts. "So what does that make Judas? Is he the betrayer, or the facilitator of salvation, the guy who makes the crucifixion possible?"

At least one scholar said the new manuscript does not contain anything dramatic that would change or undermine traditional understanding of the Bible. James M. Robinson, a retired professor of Coptic studies at Claremont Graduate University, was the general editor of the English edition of the Nag Hammadi library, a collection of Gnostic documents discovered in Egypt in 1945.

"Correctly understood, there's nothing undermining about the Gospel of Judas," Mr. Robinson said in a telephone interview. He said that the New Testament gospels of John and Mark both contain passages that suggest that Jesus not only picked Judas to betray him, but actually encouraged Judas to hand him over to those he knew would crucify him.

Mr. Robinson's book, "The Secrets of Judas: The Story of the Misunderstood Disciple and his Lost Gospel" (Harper San Francisco, April 2006), predicts the contents of the Gospel of Judas based on his knowledge of Gnostic and Coptic texts, even though he was not part of the team of researchers working on the document.

The Egyptian copy of the gospel was written on 13 sheets of papyrus, both front and back, and found in a multitude of brittle fragments.

Rudolphe Kasser, a Swiss scholar of Coptic studies, directed the team that reconstructed and translated the script. The effort, organized by the National Geographic, was supported by Maecenas Foundation for Ancient Art, in Basel, Switzerland, and the Waitt Institute for Historical Discovery, an American nonprofit organization for the application of technology in historical and scientific projects.