By the 4th Century there were dozens of little "alternative" (and fake) "gospels" which presented no gospel (good news) at all. At this time Christianity was making impact on the Roman Empire so everyone was jumping on the band-wagon. Such different gospels (such as Jesus PLUS Judish practice was required in the new faith) were even initiated in New Testament times...and a number of the letters in the bible are targeted at battling such distortions.
This is a yawner--timed by National Geographic to correspond with the release of the (stupid and actually history-less)DaVinci Code movie.