Coptic

In class we've briefly discussed an ancient gnostic text which was written in Coptic. Coptic is a language that I'm not very familiar with. I remember last year when the Gospel of Judas became a very big deal. A single copy of a shattered manuscript covered in so much controversy or at least that's what the commercials wanted you to believe. That was also written in Coptic. I was reading in the DJG about the Languages of Palestine and Coptic was not mentioned, that does not mean that it wasn't spoken there but it was not one of the primary languages from what I was able to gather. Coptic is an evolved written form of the Egyptian language from what I understand "Coptic was used from its Christian beginnings in the late second century AD. till the time of the Great persecution of Diocletian in the early 4th century AD. predominantly as a translational tool from Greek to Egyptian. "(Quote taken from THE ST. SHENOUDA THE ARCHIMANDRITE COPTIC SOCIETY's website which was written by Hany N. Takla who has delivered many lectures at colleges and universities such as UCLA) I'm wondering if these gnostic gospels were originally written in Coptic and if they were then how is it explained that they were written over 150 years after the Resurrection of Christ and more accurate than the Gospels we have. I have not done any extensive research on these manuscripts origins but they have become of an interest to me as well as a want for a better knowledge of the Coptic language.