Upon attending a philosophy class, a young Christian college student, Josh Wheaton, struggles against convincing his professor, who hates God and disbelieve in his existence, the thing that leads Josh to enter a long debate to convince him that he is wrong by providing him with evidences.
The film is slickly produced, with a competent cast, and although it sometimes stacks the deck shamelessly in defense of its credo, it does allow a few dissenting voices to slip into the debate.
The prostelytizing concept immediately loses credibility because no teacher at a legitimate academic institution would make that demand, augmenting it with threat of failure.
Will likely get a mildly, if unenthusiastic, passing grade from its target audience, but for the non-believers, it's going to prove a tough and condescending experience.