On Oct. 31, 1517, Martin Luther nailed his 95 theses on the church door in Wittenberg, Germany. This past Sunday, many congregations celebrated this event as a catalyst for the way the Reformed faith came to be and continues to understand its calling. “Presbyterians celebrate the tradition that grounds their faith on Reformation Sunday,” according to the Presbyterian Historical Society, which publishes bulletin inserts highlighting a significant figure or event in the Reformation.