"- When did you begin to believe you were Jesus?
- When did you begin to believe you were a psychiatrist?"
Amazing story! The questions, the answers, even the unanswered questions, they all say so much. The twists in the movie show how weakly we believe in human knowledge. Historical changes in science and religion are presented and also corroborate that idea. All we need is someone to tell us a coherent and believable story, as John does along the movie. The drama becomes clear with the repeated line "anything is possible", letting our beliefs scarily small. But in the end, beliefs are all that are left to us...
To me, the movie just fails in exploiting the possibilities of cinematography. John's house is the only setting. I mean, the movie is about the whole world, right?! The things that John said about it, I had to imagine all of them, like if I were reading a book.