The dead sea scrolls according to what I know are referred to as "External books", i.e. ancient scrolls written by Jews and were not included in the Bible (the old testament).
Those who know the bible well, know that the historical documentations described in the bible end around the Period of construction of the 2nd Temple. Any further misadventures of the Jews in the Holy land were documented by different authors, some scriptures accepted by Jews as their history, while others were not.
I don't know much about the gospel of Judas, but according to what I heard, I think that Christians should accept some of it to their teaching and beliefs.
The history of violence by the Church, especially against the Jews is partly (or mainly?) because of its description of Judas Iscariot as an evil person without any morals, the greatest traitor known to mankind. The demonification of Judas and making him a metaphor for all the nations who were unwilling to accept Christianity, led to centuries of violence, something that Jesus, as you remember, was opposed to.
On the other hand, didn't the New Testament claim that Jesus loved Judas, even more than his other disciples? Didn't Jesus know that he's in grave danger, that the Jews dislike him and that the Romans want his head? Didn't he know that he's about to die at the cross?
He did, probably. Furthermore, he knew that he needed to sacrifice himself to become a martyr. So perhaps Judas' betrayal was not a betrayal altogether, but just a part of Jesus' masterplan? So if Judas was merely Jesus' tool, how does that make him evil? That is something that should be reconsidered.
How was that turned from a topic about Egypt to a topic about religion?