"America's Spiritual Leader," "The Divine Ms. Winfrey" and "Reverend Oprah" are some of the titles Oprah Winfrey has been given over the last 20 years. Maybe "The World's Pastor" could now be added to the list since her show is broadcast in 136 countries. In just the United States alone, her show is seen by an estimated 49 million viewers. "Oprah has emerged as a symbolic figurehead of spirituality," says professor Kathryn Lofton, who has analyzed the religious aspects of Winfrey in two papers she has written. "Inspirer-in-chief" is what Marcia Nelson calls Oprah. Nelson is the author of "The...