Mollie Ziegler of the Get Religion blog definitely “gets” the significance of the media blitz behind the Gospel of Judas:
The thing is that for those who know their church history, Gnosticism is not news. It is a syncretistic movement with roots in pre-Christian times. It reached its zenith around the time the Judas Gospel was written. And it was based on the very non-Christian idea that its adherents possessed a secret message, bequeathed to a select few, that held the key to higher life.
The problem, as Mollie rightly notes, is that Christians are generally ignorant of their own history–and further, I add, of basic Christian doctrine. Were it not so, this Gospel of Judas bombshell would be a dud.