The future of Britain is now contingent on getting an agreement on the border between Northern Ireland and Ireland. Despite this being between two sovereign nations, there can apparently be no border checks. If there are, we are told, it could lead to a religious, sectarian war. The threat of armed Catholic-Protestant conflict in Europe dates back to 1517 when Martin Luther nailed his thesis against corruption within the Papacy to the door of Wittenberg church in Germany, prompting the schism within the Church and the Reformation. Much of Europe has sorted its sectarian conflict, but not Britain. The upshot is that all the complexities of Brexit have boiled down to a threat from people with guns.