If religious faith could be packaged in a pill, the stock price of drug companies would soar. Religion, not merely spirituality, is a profound predictor of health. Spiritual practices can reduce blood pressure, strengthen the immune system, and help stave off some effects of mental illness about as well as many drugs on the market. In fact, the lack of religiosity is about as unhealthy as 40 years of smoking a pack of cigarettes a day. If you care about your health, you might want to start going to church and praying regularly.