When at a family dinner, and somebody wants to say grace, what do you do?
I have to concur with heathenFarmer completely.
If it is in my house I remind them to keep their delusional rituals to themselves and in someone else's I remain silent and composed out of respect.
I hold hands with everyone else and stare intensely at my food while drooling, waiting for the nonsense to be over. Lol.