Who arranged it?
Grin and bear it if you cant avoid it and dont say anything controversial.
Lie or avoid if given the loyalty questions. (do you believe the fds is god chosen chanel / do you still believe in jehovah etc etc.)
I would never allow myself to cornered into it in the 1st place but we all have different circumstances and paths to freedom.
Keep what you say to a minimum and hopefully it will just be seen as "encouragment".