"I believe in God…" begins the affirmation of the Apostles' Creed. But does what you believe make much difference in how long you live, or even more pointedly, in the quality of the life you live? It does, contends a growing body of scientific evidence. The relationship between your belief system and your health is better documented every year. Dr. Harold G. Koenig, director of Duke University's Center for the Study of Religion/Spirituality and Health says scientists and doctors "have to confront it. They can't just say religion is irrelevant to health. It is relevant."