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Gnosticism as a movement is from 300a.D. when Gnostic Apocrypha started to spread at Europe.
It's past the Gospels (Gospels are from the first century, as old as 40a.D.) and they taught that Jesus was a different person from the Gospels. It's very similar to Christianity, and that's why it's very dangerous, because it denies Christ as being the son of YHWH.
Gnosticism got a new breath after Dan Brown books that included subjects about Christianity, as the author made allegations that these Apocrypha were older than the Gospels (a blatant and easily refutable lie).
Only those who don't understand the deep cultural and social contexts of the Old Testament will embrace the arguments for Gnosticism. People don't understand how the Torah was built by the Israelites, as also they don't understand the details about the Textual Criticism of the Old Testament that great theologians are dealing for centuries.
I suggest the podcast (also the books) from Dr. Michael Heiser, theologian, a biblical scholar, PhD, specialist in ancient Semitic languages, about sections of Exodus and other books of OT.
Those who believe in Gnosticism can't accept the truth of the Gospels without distorting it, and this kind of faith may bring eternal damnation, as the works of Salvation from Jesus Christ can only manifest in those who accept the truth of the Bible as it was given to us.
It's truth that Gnosticism is just another man-made pile of concepts from different sources that tries to explain the existence of evil in consideration of the existence of an all powerful god that rules the world. But the conclusion that this god is compliant to evil is not based on a serious biblical exegesis, but more like a dishonest contrast between Jesus and the Old Testament God.
However, it was Jesus that gave the majority of the mentions about eternal damnation, hundreds of that, in comparison to around three in the OT. Jesus is the biblical character that spoke most about hell than anyone.
