I like the idea of waiting until THEY bring it up. Always stand tall, direct eye contact, firm handshake, broad smile. Let them see you're fine, happy, and confident. Here are some responses for nosy questions:
Q. "Have you left the TRUTH?" A. What do you mean by leaving the TRUTH? It's just there, isn't it?
Q. "Have you left Jehovah?" A. I am secure in Jehovah's love and care. (smile)
Q. "We missed you at the meetings." A. I am touched and honored that you miss me. Give me a call and we'll go for coffee, OK? (slap on shoulder)
Q. "Are you going to the meetings?" A. You mean all of them?
Q. "Have you left the Jehovah's Witness?" A. Why yes, and I'm enjoying every minute.
Q. "You should...(scorn materialism, care more about spiritual things, yadda yadda)." A. You should go to a dentist or something. Your breath stinks. Do you have gingivitis? (They are invading your personal space. Right back atcha)
I also like Richie's general response with his peers. If he caught one of them in a secret sin, he'd take them aside and let them know their secret was safe with him. Then he'd casually mention where he stood with the congregation. He made sure, you see, that they daren't fink on him.
He simply avoided the snotty busybodies.
Sometimes a great offence is the best defence.