Religious zeal refers to an intense passion and fervor for one's faith, often manifesting in strong advocacy, devotion, and commitment to religious beliefs. This fervor can drive individuals or groups to take action in the name of their faith, influencing various aspects of society, including political decisions and conflicts. During significant historical events, such as the Crusades, religious zeal became a powerful motivator that inspired many to embark on military campaigns, believing they were fulfilling a divine mandate.