"Don't you people believe that your God will kill everyone who isn't a member of your religion?"
"That isn't for us to say. Only God can judge hearts."
"It certainly is for you to say! Doesn't your religion teach that very thing?"
"No, it doesn't."
Your fictional account was very acurate. How many times have we asked questions of witnesses only to have them lie? As far as these people are concerned, they're out doing Gods work and yet they still lie! I will definately use this mode of argument when I next spot them counting hours in a coffee shop.