Martin Luther nailed his 95 Theses to the castle door in Wittenberg over 500 years ago. Happy Reformation Day! What’s the first word or image that comes to mind when someone says October 31? Maybe it’s a costume hanging in your closet or your favorite candy or the fall festival your church is hosting. Maybe it’s the pumpkin carving contest that didn’t quite go as planned. For me, I think of my college Bible professor dressed in a long robe and hammering parchment paper to his office door to reenact the start of the Protestant Reformation. Most people celebrate October 31 as Halloween, but few realize this day marks a milestone of Christianity. On…