Exercise and Fitness

Pick a country, any country, with a long non-Christian tradition - Japan, Iran, or Tonga - and imagine many of of the citizens taking on the entire set of paraphernalia of the Roman Catholic church, from confession to Gothic steeples to a different Bible to child molesting - and then systematically denying that any of it was religious. The "priests", while teaching classes in confession, communion, and all the other rituals, are insisting that they are exercises, purely aesthetic experiences with no religious content.

And then they start inventing really weird combinations of confession and mud wrestling, Easter and televised kick-me-in-the-gonads games, S&M Jesii clubs, and stuff like that.

It's worth a satirical novel, at least.