Scientology plays a huge role in my life. It is a practical religion. It contains wisdom and practices you can use in life to make life go better for you and for those close to you.
I use it all the time. I use it to get on with others, to keep up with the advances and new technologies in my field (computers). I use it to help friends who are having troubles with relationships or other areas of their lives. I use it to evaluate what car to buy :)
It contains knowledge that is applicable to almost every area of life. There is not sufficient time to go into it all, but that link about "what car to buy" is just an example of the practical nature of the religion.