It is very progressive of you to even consider for a moment the validity of Gnostic beliefs/mythology (even though you've not indicated a pro or con stance).
There is alot of new info that the younger generation of worshipers will be exposed to ("TRUE worshipers", John 4:23).
The other day, I read most of the Apocryphon of John (it seems the ancients expressed a lot of fantasies in this manner). I was not impressed (it all seemed rhetoric and jargon, a system/game to navigate).
Jesus caused the end of the age of time (He came in "the fulness of time", Ephesians, the end/completion of time).