I want to say (whether rightly or wrongly I don't know) that the problem of monotheism is theological, spiritual, intellectual, and psychological (since our psyches are fallen, after all.) So it's bound, as I see it, to show up in heresies and errors.
So, despite the disparaging remarks of this writer, I admire Plotinus because he stuck to his neo-Platonism with rigor and contended with dualistic gnosticism, pagan philosopher though he was.
It always strikes me as funny that the colors of my order are black and white, but Dominicans are very refined and nice in their perceptions of shades of gray.
I like to say (with an eye to Chinese Buddhism) about humankind and creation, "Not good, not bad, both good and bad, neither good nor bad ...but FALLEN -- but in their origin and destiny (as offered, though some will despise it) very good, as God himself said."
After all, God intentionally put the Tree of the Knowledge of Good and Evil in the midst of the Garden of Eden.