This is the most ridiculous thing I have ever heard. What would they give a film with full nudity and religion in it? An X? Adam and Eve beware, the MPAA is using drugs it seems.
In the 1950s, the Comics Code Authority slammed EC Comics (publisher of Mad, Tales From The Crypt, and Weird Science, among others) for a comic story that ended with the revelation that an astronaut was black.
Censorship boards (whethere they are "industry" self-regulation or government imposed) have the power to condemn works they disagree with on whatever grounds.