Tell them you believe in the Holy Trinity.
We tried that once. Got a newbie. She could not talk her way around any of our points. She came back the next day, with her trainer. As soon as we started making salient points, she grabbed the newbie’s arm, and said, “Come on. We’re getting out of here”. The woman looked like evil personified. She actually looked like a deadly snake. I can’t exactly describe how, but I just saw a serpentine look to her. I felt sorry for the newbie; she was very nice, and you could tell she had been hornswaggled, because she didn’t know anything about Christianity, when we were telling her about it.