This so-called documentary is yet another attack on Christianity by the National Geographic Channel.
Ostensibly an authentic Christian text which was suppressed by the Catholic Church, it is, in reality, a Gnostic text and has nothing to do with Christianity.
Gnosticism predates Christianity and proposes that there are actually two gods, one of the spirit (and thus good) and one of the physical world (and thus is evil).
Having seen the effectiveness of Christianity, the Gnostics usurped practically every Christian character and theme in order to make their claims "valid" in the eyes of the early Christian followers. Thus the god of the old testament was made to correspond to the "god of the physical world" and the Christ as the "god of the spirit".
In the Gnostic world Jesus was not even physical (for being of spirit, he could have no flesh, viz. flesh=evil) and thus could not have been really crucified. As to Christ's spiritual nature, only those of "the true faith" had the secret knowledge (Gnosis) which was passed on orally (through secret words) from Christ to his (Gnostic) followers.
For those unfamiliar with Christian history, don't be fooled. - The National Geographic Channel has chronically tried to undermine Christian beliefs by "examining" such "suppressed" books and claiming that Gnosticism was a legitimate Christian sect, when, in fact, such texts as "The Gospel According to Judas" and those found at Nag Hammadi (e.g. The Gospel of Mary Magdalene and The Gospel of Thomas) were written by Gnostics three or more centuries after Christ's death.