This is a game I once played in YRUU conferences. It most likely exists in other places as well, and it certainly has no real religious context. The rules are pretty simple. A few (or a lot) people sit in a circle and the first person has a small dialogue with the second who in turn continues on down the circle:
First: Wanna buy a duck?
Second: A what?
First: A duck.
Second: Does it quack?
First: Of course it quacks, it's a duck!
Second: Wanna buy a buffalo?
Third: A what?
Second: A what?
First: A duck!
Second: A buffalo!
Third: Does it taste good with haggis?
Second: Does it quack?
First: Of course it quacks, it's a duck!
Second: Of course it tastes good with haggis, it's a buffalo!
Third: Interested in orangutans?
As you can see, the game is goes in circles. If you stick to animals and the script above, this whole things can quickly become boring. So be creative. Ask people if they would like to procure a cheap country. Demand that items for sale can perform the impossible. The questions and answers travel through the circle like brushfire. As the game progresses it gets more and more hard to remember and eventually, devolves. Also, being sleep deprived, drunk, or high on something, can make this game quicklty fall into surreality.
"If it couldn't quack then it wouldn't be a duck, idiot."
Another thing to do is start repeating people, as in have a circle of four people and go around twenty times. This gets really crazy. Then people start to go non-linear, all semblance of a circle lost, and madness ensues.