Facing the Giants: does showing this movie in class violate the First Amendment?

[Fridays Child]

As a substitute teacher, I'm directed to show a lot of movies to students. I worked at a junior high school, today, and the teacher instructed me to show Facing the Giants to three class periods. At first, I thought it was just another high school football-themed movie but I quickly realized that it was nothing so benign as that. This movie is pure, unadulterated, Christian evangelical indoctrination. There's just no other way to describe it.

The trailer is deceptive, in that it doesn't expose how overtly religious the movie is. But here and here are segments of the film that are more exemplary of its real intent.