The movie is very good but frankly it’s a grisly ending. Plainly he witnessed his mother’s murder and had to kill in turn.
I’m not sure preferring the nicer but implausible alternate story is much of an endorsement of a real God.
I like a movie that makes you think and mull it all over at the end. That’s exactly what ‘life of Pi’ does, and it does it well.
Most movies these days are crap and not worth sitting through.