Grant says the Sethians cannot be considered Christian as they worshiped a different god. Makes sense.
Grant finishes by speculating why they disliked the Demiurge.
They were too invested in the Old Testament, as original Jews. They were stuck.
Yet they were bitten by the Plato bug of the One.
So they bit back as their relationship with other Jews and Christians fell apart.
They wrote their texts mocking the biblical creator and attempting to find a higher god.
They also mocked the Demiurge of Plato.