The real religion that it is based on is called Eckankar. Follow the link to see info: http://en.wikipedia.org/wiki/Eckankar
I saw the movie and was also curious. Hope that helps.
I found a link that states it is a "real religion given a fake name to avoid copyright issues" at the following link, which then goes on to tell more about it, and the movie "Stone" that it was in, a small budget movie starring Robert De Niro and Edward Norton.
See the link below.