Desire is brought on by Demons.
Temptation brought on by demons.
Lust brought on by Demons
Sinners are all these things, what happens when a very certain Demon king tempts a sinner?
I believe he was castes out of heaven because he love God so much that when God created humans and told the Angels to bow down to us, Lucifer couldn't and said that he couldn't love anyone else more than God.