Well, of course don't say jw, say " are the Jehovah's; witnesses at your door Pedophile's?" Most people would recognize that. I agree unless the target audience is current Jws, the lingo should be changed. Maybe, after asking are the Jws at your door pedophiles, one could say, " Do you know their church elders wouldn't tell them if they had a pedophile in their midst ?
That would be of real interest to everyone b/c almost everyone knows jws go door to door , like most people know Mormons do also.
I think knowing a potential pedophile was coming to my door would certainly be of general interest due to the laws regarding how far away they have to be from children.