Tebow's a great player. I don't know if his skills will transfer to the pro game, but he is an excellent college player. Heisman? Not if others are having better years and I can think of at least a couple of other guys having better years than he has had.
I think the Bible verses on the eye black is a bit much. And I say that as a former theology minor who briefly considered going to seminary and am very active in my congregation. I don't say that to contend that I'm some kind of expert on the public display of religion, but to make it clear that I'm not from the Christopher Hitchens/Richard Dawkins school of thought.
But, different strokes for different folks.