Life of Pi

I feel it's easy to try and understand this book at surface level and just take it for what it is. However my interpretation is of a human who has experienced something extremely difficult and in conclusion of this story he wanted to gift us with his means of survival rather than the main focus being for us to believing this outlandish story of his survival. I guess my conclusions is we have to ask ourselves why is one story easier for us to believe than the other and how much the power of interpretation can help in situations of extreme difficulty.