Satan is an angel.
Satan can only appear as an angel; he is not, in fact, an angel.
Satan once was Lucifer.
The Bible never states or assumes this.
Satan fell from perfection.
No verse indicates or assumes this.
Satan is a cherub.
No, Satan is a serpent, an ancient dragon.
Satan is the ruler of Hell.
Hell is Satan’s future prison, not his kingdom.
Satan’s angels are demons.
No angel is ever equated with demons; demons are something else entirely.
Satan is responsible for all of the evil in the world.
Man is wicked enough; Satan is probably responsible for surprisingly little of the world’s evil, though all of it glorifies him.
Many common ideas about Satan, I simply have difficulty finding any evidence of in the Scriptures. Knowing one’s enemy is quite important in warfare. Are you willing to push aside the traditional view of Satan in favor of a biblical one?