The Motion Picture Association of America is crystal clear when it describes why its "PG" rating exists — it's a warning flag.

"The theme of a PG-rated film may itself call for parental guidance," states the online explanation of the rating system. "There may be some profanity in these films. There may be some violence or brief nudity. ... The PG rating, suggesting parental guidance, is thus an alert for examination of a film by parents before deciding on its viewing by their children. Obviously such a line is difficult to draw."

Disagreements are a given. The Christian moviemakers behind a low-budget film called "Facing the Giants" were stunned when the MPAA pinned a PG rating on their gentle movie about a burned-out, depressed football coach whose life — on and off the field — takes a miraculous turn for the better.

"What the MPAA said is that the movie contained strong 'thematic elements' that might disturb some parents," said Kris Fuhr, vice president for marketing at Provident Films, which is owned by Sony Pictures. Provident plans to open the film next fall in 380 theaters nationwide with the help of Samuel Goldwyn Films, which has worked with indie movies like "The Squid and the Whale."

Which "thematic elements" earned this squeaky-clean movie its PG?

"Facing the Giants" is too evangelistic.

The MPAA, noted Fuhr, tends to offer cryptic explanations for its ratings. In this case, she was told that it "decided that the movie was heavily laden with messages from one religion and that this might offend people from other religions. It's important that they used the word 'proselytizing' when they talked about giving this movie a PG.

"It is kind of interesting that faith has joined that list of deadly sins that the MPAA board wants to warn parents to worry about."

Overt Christian messages are woven throughout "Facing the Giants," which isn't surprising since the film was co-written and co-produced by brothers Alex and Stephen Kendrick, who are the "associate pastors of media" at Sherwood Baptist Church in Albany, Ga. In addition to working with the megachurch's cable-television channel, they created its Sherwood Pictures ministry — collecting private donations to fund a $25,000 movie called "Flywheel," about a wayward Christian used-car salesman.

"Facing the Giants" cost $100,000 and resembles a fusion of the Book of Job and a homemade "Hoosiers," or perhaps a small-school "Friday Night Lights" blended with the Billy Graham Evangelistic Association movies that used to appear in some mainstream theaters. Sherwood Pictures used local volunteers as actors and extras, backed by a small crew of tech professionals.