Let's say yhwh really wanted to save the debil and his demons, how could it be accomplished. Here is one method. Tell me if you think it would work.
Force them to incarnate, the same way that jesus/archangel was. Do you think that they would be too bad for the rest of humanity to endure? Simple solution, incranate them into bodies or beings on another planet, say mars.
Mars might be livable w the right bodies, the right metabolism, etc. So, after many lifetimes of rough living and dying, the debil, and the demons would be softened up, accepting the idea that they need yhwh's loving warmth. No? Maybe yhwh is too lazy to go to all this effort to save some of his children, and so would rather just extinguish them.
SS