The most anticipated summer in Scottish soccer in a generation started with a public outbreak of perhaps its deepest-rooted problem. Glasgow saw the kind of religious sectarianism that has long poisoned relations between fans of Rangers and Celtic one month before the city hosts two national team games at the European Championship. Celebrations of Rangers’ title-winning season turned sour with anti-Catholic chants. It happened in the city square that will host a Euro 2020 fan zone and was fiercely condemned by lawmakers and soccer officials. The national team’s popular Tartan Army of fans aims to repair the reputational damage at Euro 2020.