Who's right is it to decide?

So I've been reading more of Life of Pi and something very interesting has occurred. After Pi discovered Christianity, he became Christian while still practicing the Hindu faith. When he's 16, he discovers Muslim and decides to practice that too. So now Pi practices Hinduism, Christianity and Muslim all at once. He tries keeping it a secret, but soon his parents find out and get 3 people who've been teaching Pi the separate religions, to all meet one another.

Obviously chaos erupts. Everyone is furious at how Pi is practicing all of these religions, they feel that a person can only have one religion and stick with it. It's interesting because the characters are usually calm and collected, but as soon as a rivaling religion is mentioned all hell breaks loose.

Personally I'm with Pi, it doesn't really matter which one you practice, if you feel love for god then he won't mind. He talks to his mother who says that all these religions are like passports to heaven. Pi responds with "Well shouldn't all these passports be valid for the same place?" Very interesting. It's become very clear why a book like this would be taken off the shelves of any religious area. The thought of practicing more than one religion is frowned upon by devout people, they would never want the thought that any other religion is right. Sad really, so much blood has been shed over religion, yet in the end it really doesn't matter. The battle one must fight isn't on the outside, but on the inside, where god truly matters.

At least, that's how I feel...