The Spanish novelist Cervantes wrote his famous tale about a knight-errant almost 200 years before the the 1st Amendment to the U.S. Constitution was adopted. But as Eric C. Graf, Professor of Literature at Universidad Francisco Marroquín, explains, Don Quixote paved the way for freedom of religious conscience by championing the freedom to think or believe what you want in your head.
Religion & Liberty Online
Don Quixote, Pioneer of Religious Freedom