Reformation Day 2025, Oct. 31 -- Halloween is celebrated on 31 October in the US. But did you know that the day is also marked as Reformation Day? According to Britannica, Reformation Day commemorates the anniversary of the day when Martin Luther, a German monk, is believed to have posted his Ninety-Five Theses on the door of the Castle Church in Wittenberg, Germany, in 1517. In the later years, Protestants identified the event as the beginning of their reformation.

According to National Today, Martin Luther was aggrieved by the activities of the Catholic Church. Luther is believed to have disagreed with certain teachings of the Church, such as the priest acting as an intermediary between humans and God, and the sale of indulgences, whos...