Predestination that you are incable of knowing doesnt change the fact that from your perspective: you and you alone decide for yourself what your going to do in any given situation.
The one attempting to argue symatics here isnt me.
It doesnt refute anything whatsoever when you put Stenger up against Augustine and Occum with his razors.
Not all theologians say evil comes from "satan" (which wouldnt matter eaither since god made the devil) and being all powerful the devil must work for him by Stenger's model or not exisit at all, which only really addresess the issue of omnibenevolance.
Which btw isnt one of the criteria of being a surpreme deity persay.