ROME — Europe is experiencing a crisis evidenced by a “wave of populism” that threatens European universality, Pope Francis warned Saturday. In a message to participants in the European Alpbach Forum, an Austrian nonprofit foundation advocating a strong and democratic Europe, the pontiff said that Europe is “experiencing a time of crisis,” a time “in which various populist movements are enjoying great popularity.” In Europe, “as a result of this ‘wave’ of populism, some ideals have vanished and some principles, with regard to behavior towards the weaker members of society, have been sidelined,” he added.