In the United States, we often assume religious and spiritual identity are pure, static, and singular. But some people regularly cross religious boundaries, and in the process they blur social categories, evoke prejudice, and complicate religious communities. Through in-depth conversations with these "spiritually fluid" people, Duane Bidwell considers what this expanding demographic can tell us about faith, tradition, race, and nationality, while suggesting that it offers an opportunity for greater understanding among believers of all types.