Because he doesn't exist.
Asking for a friend.
Russia.
I'll update with the hilarious punchline later...
SNOE
The patients get better and leave. Not everyone of the patients thinks he is God. The staff have the keys!
Two. One to actually do it, the other to film it so fundamentalists won't claim that God did it.
Nothing because ghosts don't exist. Edit:Holy crap I just realized I didn't post this on /r/antijokes.
My tax refund.