I agree, that this truly is a tempest in a teapot. There have always been gnostic gospels and I've been amazed at recently so many fiction writer have been doing mysteries that "seek to twist and claify Christian values". The Da Vinci Code--everyone knows is fiction, but what does it do to belief systems. Dave Barry's The Third Secret does a smiliar thing that attacks the Catholic Church's belief that priests cannot marry. I just call tomes like these Today's Gnostics. I read some of these gnostic texts years ago. My favorite one to snicker about was the one where it was purported Judas and Jesus played together as children in Egypt. There's also a Gnostic gospel devoted to Mary Magdalene. Take it with a grain of salt.
Barry's, "The Third Secret" would have been better had it only to do with a married clergy. While the first half of the book is great, the second half can't even kindly be called tripe. It took many beliefs that predate Christianity and called them lies (pious and holy beliefs held by Jews and given down by God). Spoke of how Mary actually favoured allowing abortion and pre-marital sex.
Gnostics were sincere (for the most part) in their beliefs (even though they were wrong) and wrote Gospels to "validate" them (commonly in the 2 thru 4 centuries).
The Church (Catholics, Coptics & Orthodox still all being united) in the 3rd and 4th century got together at the Council of Hippo and the Synod of Carthage and clearly stated which books comprised the New Testament. In order to weed out false testimony they capped the writings to the first century. This however does not mean that many 2nd & 3rd century writings are untrue.
To counter untrue beliefs (Aryans and Gnostics, plus other wackjobs), the Church held Ecumenical Councils to dispell the untruths and cement the actual truth. It is out of these Councils that we have the Nicene-Constantinopolitan Creed (commonly shortened to Nicene Creed or Confession of Faith)