The fuse was lit on October 31, 1517, when a passionate Martin Luther, a German theologian, nailed his 95 Theses to the door of the Castle Church in Wittenberg, Germany. This daring act challenged the authority of the Catholic Church, sparking the Protestant Reformation. Luther's courage ignited a firestorm, questioning corrupt practices like indulgences and sparking a wave of discontent among Christians. This pivotal moment marked the beginning of a religious revolution that would reshape the course of Christian history.