I don't understand you. What are the Nag Hammadi books then?
Like the bible, they are basically discussion and debate tools that the ancients used to help them seek the best rules and laws to live life by when all knew that all the supernatural Gods were imaginary. Listen to what the more intelligent ancients thought before idol worship of imaginary Gods began.
http://bigthink.com/videos/what-is-god-2-2
You might also remember that most of the ancients, even in Jesus' time did not suggest the literal reading of myths.
http://www.pbs.org/moyers/journal/03132009/watch.html
Rabbi Hillel, the older contemporary of Jesus, said that when asked to sum up the whole of Jewish teaching, while he stood on one leg, said, "The Golden Rule. That which is hateful to you, do not do to your neighbor. That is the Torah. And everything else is only commentary. Now, go and study it."
Please listen as to what is said about literal reading.
"Origen, the great second or third century Greek commentator on the Bible said that it is absolutely impossible to take these texts literally. You simply cannot do so. And he said, "God has put these sort of conundrums and paradoxes in so that we are forced to seek a deeper meaning."
Matt 7;12 So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets.
Regards
DL