Actually there is a guy that does pretty much the same thing in downtown Chicago. No banners, but he does have a Karaoke machine that he uses as a loudspeaker. He's actually pretty amusing...
"You can't go to heaven smokin' no cigarettes, you can't go to heaven smokin' no reefer"
"You can't go to heaven bein' no homosexual, God does not like gay people"
It's pretty darn funny.
Anyways, everyday that I saw him I would go up and ask him for a cigarette.. he would just turn beet red and start screamin about cigarettes again.