On Friday, Oct. 13, 1307 Templar knights from across Europe were arrested, tortured, and murdered under orders from Pope Clement V. Christian Inquisitors conducted the massacre. Templar wealth and lands were confiscated by the local monarchs and the Church. The worst acts occurred under King Phillipe of France. The leader of the Templars, Jacques de Molay, was slowly roasted over a fire in 1314.
Friday the 13th has been considered unlucky and evil ever since.
History shows that these kinds of atrocities are common when religion and state are mixed, even with a peaceful, "loving" religion like Christianity. This is the horrific lesson learned from the Middle Ages, when Christianity was endorsed by governments. And, this is why modern, democratic nations are secular and will remain that way.