Christ has incarnated countless times within different initiates who have properly prepared themselves. As for numerology within the Gnostic scriptures, that is symbolic in nature and refers to spiritual forces we must develop within our interior.
The scriptures are not literal, but abstract, cryptic and symbolic. In other words, they are pure Kabbalah. We suggest you study the introductory information section, especially in relation with Alchemy and Kabbalah, because proper interpretation of the Nag Hammadi depends upon a firm knowledge of the Hebraic mysteries upon which they are founded.
To read the Gnostic scriptures without knowing Kabbalah is like trying to read Shakespeare without knowing English. It is simply indecipherable, and people without knowledge of Kabbalah more often than naught come to absurd conclusions about these writings, including learned scholars and academics. Not only is a contextual, integral and profound knowledge of Kabbalah necessary for deciphering these great works of literature, but also experiential, conscious wisdom. It is a balance of study (knowledge) and experience (being). Therefore, learn the symbolic language of the Gnostic scriptures first, and then study them. One first needs the key of Da'ath (knowledge) in order to open the doors to understanding (Binah).