There are many kinds of Gentile Gnosticism. All of them are corruptions of Kabbalah. The most common form of Gentile Gnosticism is the kind found in Marcionism and Manicheanism and Mandaism where their soteriology was only through knowing the "Great Secret" whereby they identify the G-d of Abraham Isaac and Jacob as Satan. They believe in Sons of God called Uthras (Aeons). For them, anyone who accepted this secret was saved.
These religions are so corrupted that they need to have their scriptures corrected in order to become Noahites.
The Zoroastrian Abbasid solution was to worship the Demiurge and reject the idea that there are any other gods.
The Judeo Gnostic solution is somewhat more Zurvanite.