ACLUer says a Christian group at a school can see a movie with a Christian theme.

“The Fellowship of Christian Athletes is a club,” Mr. Regnier said. “The school doesn’t endorse one club or another. Obviously, they have to abide by the school rules … . It’s not a school function; it’s this particular club’s function.”
Kent Willis, executive director of the Virginia branch of the American Civil Liberties Union, agreed, saying that as long as the school isn’t sponsoring the event, student religious groups are allowed to hold regular meetings and special programs with religious content.
”As long as the school isn’t using some exceptional means to promote it, and if the school is allowing the promotion the same way as any other event, it’s perfectly fine to do so,” Mr. Willis said.