To make it absolutely clear, God has never said that there exists a fallen angel satan, the devil or demons.
So what/whom Jesus cast, you ask.
Well, if God didn't tell people about existence of a fallen supernarural powers but they have picked-up the pagan beliefs (for whatever reason) then people keep fight with their idol/s.
It sounds silly, doesn't it?
By the way, do you know what Jn 10:10 speaks about????