I disagree. I think Satan and his minions believe that God is the bad guy. There are some interesting allusions to this concept in the parables of Jesus.
If you could give scriptures to back up you claim that "satan doesn't know he is sinning".
Aside: I assume Satan is much, much smarter than I, yet even I know I sin. Got to think Satan has figured out whether he has sinned.
Definition of Sin: Anything going against what God commands. Thus, Satan has to know he has disobeyed God and therefore sinned. Now, like some on here, maybe Satan has his own dictionary.