smw
It is very unlike Christianity, although it shares some of the same mythology. Gnosticism is based on knowledge rather than divine revelation.
The Valentinus Gnostics apparently were a Christian tradition, although not accepted by the mainstream church and considered as Christian heresy. As I understand it the canon of acceptable Christian works were made and some were not considered suitable. I think this may be why the findings at Nag Hammadi created interest about those early times of gnostic/Christian thought. Carl Jung apparently at one time acquired a manuscript fragment (called now the Jung Codex) though is now in the Coptic museum in Cairo.
https://en.wikipedia.org/wiki/Valentinianism
http://gnosis.org/gnostic-jung/
*from the Valentine link - "a figure entirely peculiar to Valentinian Gnosticism is that of Horos (the Limiter). The name is perhaps an echo of the Egyptian Horus"
so many threads to chase