He starts out as a Hindu and then a Catholic priest tells Pi about Christ and he becomes a christian, but see's no reason why he should stop being Hindu. Later he begins practicing as a Muslim, but still considers himself a Christian and a Hindu.
"In the present day, the journalist asks the older Pi which of the stories is true. Pi turns the question back at him by asking which one he prefers to believe. The tiger story, the journalist says."
“So it is with God,” says Pi. And that’s where the film ends.
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