The author of the Gospel of Judas wasn’t against martyrdom, and he didn’t ever insult the martyrs. He said it’s one thing to die for God if you have to do that. But it’s another thing to say that’s what God wants, that this is a glorification of God.
The Gospel of Judas really has been a surprise in many ways. For one thing, there’s no other text that suggests that Judas Iscariot was an intimate, trusted disciple, one to whom Jesus revealed the secrets of the kingdom, and that conversely, the other disciples were misunderstanding what he meant by the gospel.
What is clear is that the Gospel of Judas has joined the other spectacular discoveries that are exploding the myth of a monolithic Christianity and showing how diverse and fascinating the early Christian movement really was.