Life of Pi was pretty good. A bit slow, but it brought the book to life fairly well. The challenge was always keeping the story moving when so much of it took place in the middle of the ocean, there are only so many ways in which one can avoid being eaten alive by a Bengal tiger so some suspension of disbelief is required. I really enjoyed the shots of India at the start. I don't know if it would make you believe in God, but I liked that Pi kept his distance from the tiger throughout his time on the boat, if you take the view that God represents everything that is more powerful than us, you could say fear of Mother Nature roughly equates to fear of God in the movie. Humans might be able to shape our environment in ways that no other species can, but there are still some things even we can't control. (This has been a rather HSC English-y post!)
I'm an atheist and I loved the film.