Let's play a little game. You are my prisoner and I have given you a choice. Press the wrong button and you will die. Press the right button and you will go free. You have no reason to believe I am lying, and have every reason to believe that you may get free. You don't know that both buttons will kill you, so you assume you have a choice, but in reality your fate is sealed.
Just because YOU think there is a choice, or free will, does not make it so. An omniscient God implies that your fate is sealed. Your choices, while perhaps important in your mind, are meaningless.
Stenger's arguments are just as valid as Augustine's. Neither has any evidence for his side, although to my mind Stenger has the more logical argument, based upon the attributes of God as defined in the Bible.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.
I don't know about any generic supreme deity, but God, as defined in the Bible, is omnibenevolent, omniscient and omnipotent. So he either permits evil things to happen, which means he is not omnibenevolent, or he doesn't know when evil will happen, which means he is not omniscient, or he cannot do anything to contain evil, which means he is not omnipotent. In ANY of these cases he fails the test, a test based on his own purported words, as put down in the Bible.Which btw isnt one of the criteria of being a surpreme deity persay.