Denver Broncos quarterback Tim Tebow is an evangelical Christian. He is devoted to his faith in a very public way, and that, as much as his perplexing play on the football field, has made him a cultural lightning rod. The wise heads of football insisted before this season that he is not actually much of a quarterback, that he had a weak, inaccurate arm and a devotion to a style of play that works in college (where he was a star for the University of Florida) but not in the NFL. But his base of fans, seemingly devoted to him primarily because of his religion and only secondarily because of his play on the field, were vocal in demanding he get his chance. And he did, leading the once woeful Broncos to the playoffs on the back of one improbable fourth-quarter comeback after another.