On the record, my personal view about this is that it's exceedingly rude to suggest group prayers to groups of people including ones whose religious beliefs you don't have specific reason to believe are the same as yours, unless you are in your own home and they are visiting you. I think it's rude to place strangers in the position of discussing their religious beliefs in a setting in which they are essentially asked to take a position -- (1) Participate; (2) Don't. It's just rude. If you want to thank Jesus, why can't you thank Jesus yourself? Why does everyone else have to bow their heads for your prayer to work? You want to pray before a challenge, you have plenty of time. Go. Pray. If you learn through normal conversation that other people are of the same religious persuasion you are, then you can pray along with those people, but the notion of just acting on the assumption that unless they actively object, everyone probably wants to ask Jesus for help with every challenge? That's just mind-bendingly presumptuous. And no, "Say, is it okay if we all pray before the challenge?" is not all right. Prayer is opt-in, not opt-out. Opt-out puts people in precisely the position Brian is in, where they're going to go along whether they mean it or not, and doesn't it kind of dilute your prayer to have people in it who are only going through the motions? Just remember: according to some sources, God kind of wants you to pray in private anyway.

--Recap of Survivor, from Television Without Pity