“The apostolic exhortation Amoris laetitia, issued by Pope Francis on March 19th 2016 and addressed to bishops, priests, deacons, consecrated persons, Christian married couples, and all the lay faithful, has caused grief and confusion to many Catholics on account of its apparent disagreement with a number of teachings of the Catholic Church on faith and morals. This situation poses a grave danger to souls.” So begins the 13-page document sent by an international group of Catholic theologians, pastors, historians, and scholars “to every one of the Cardinals and Patriarchs, of whom there are 218 living at present.”Though the document was intended to be viewed...