The movie will have 3 audience-types. a) Those who see it only because of the hype, and want to see what the fuss is about, b) Christians, and possibly c) Some of those into the whole S&M fetish scene. The latter is not a strong economic force compared to the first two, and the former will likely disappear after the first two weeks, then resurge in the first two weeks of rentals. But category b could keep this movie making money for quite some time. But I think that the Lotr trilogy will still make more money as a whole, in the long run.
All of this is IMHO.