I remeber watching this episode a few years ago. What kills me is that the Christian kid couldn't just accept that his friends wanted to live, but he didn't want to be a 'spirit' in the living world.
The ironic twist was that he tried so hard to get the bodies freed from the car, the car plunges deeper into the lake with his body in it. Thus this means he ends up living while his friends disappear when the people on the boat saw their bodies.
In a way it could also be his way of damnation for trying to alter fate and by causing his friends to vanish while he is still around.