I would approach and present an ficticious illustration, just like Jesus would do. Illustrations and examples make people think. Just NEVER use JW terms or their cult-think will take over and you will NEVER be listened to again. You could say:
KW: Now..who are you with?!?
DUBS: JWs !!!
KW: Oh? I have a friend who was fired from your church, but his reasons didn't make any sense. [ watch and see if they respond ] He said that he was fired for not believing the same thing as everyone else. Does? That happen??
DUBS: Blah, blah, JW.Borg, blabbity blab...
KW: The wierd things is...He was right about what he said. There some big announcement at a "special conference" [ ??? acting confused is key ] or something. They announced all the things that he said 6 months earlier..all the things they fired him for saying. He said the that your church used to teach that not all Christians were ...[ you search for the word] domestics. Yeah, domestics, but he told your clergy that ALL Christians were domestics. Then he said that no humans were over Christs possessions yet. Then there was something about the Apostles... Oh yeah, He said that they were not part of a faithful stewart class because the church doctrine was wrong. He got fired for saying all that. and then it turns out that he was right all along.
DUBS: ????????????? [ Stupified silence]
KW: Anyway, I just wanted some new leaflet that says your beliefs. It's not that I don't believe my friend, I just check ALL the facts. There is a lot of misleading propaganda out there. ESPECIALLY in religions. They all have Billions, but always want more money, you know what I'm saying. Bye.
That's what I would do if I had the luxury of being a "stranger." Don't go all ape-shit and foam at the mouth. That simple moves them to another location, it's a quick fix. Do something more permanent. Just make sure not to hit the same group with the same " illustration."
DD