The Shenmue franchise is rife with spirituality and religion.
One thing not too many Shenmue fans know is that Shenmue is actually based off of a genre - Shenmo.
http://en.wikipedia.org/wiki/Gods_and_demons_fiction
It's a genre of Gods and Demons. It's a Chiense genre that traditional mixes spirituality, religion, martial arts, and ethical lessons into a beautiful package. My favorite book of all time, Journey to the West, is one such example, and the book is famous for its Buddhist allegory. I would make the argument that Shenmue is a Taoist allegory, and still blends the religion and martial arts of the genre's tradition.
Something to consider. I'll post the article whenever I get the chance.