Why are Orthodox Christians divided into those who follow the "Old Calendar" and the "New Calendar?" How did the "New Calendar" come into being? Why was it adopted by the State Church of Greece in 1924, and under what circumstances? The Struggle Against Ecumenism was written to answer these questions. It provides a history of the events in Greece that led to the adoption of the "New" or "Gregorian" Calendar in 1924, how the traditional Orthodox Christians of Greece opposed it, and what they suffered because of it. It is the most complete such history in the English language, and provides the texts of many original documents—the writings and encyclicals of those responsible for adopting the New Calendar, and of those who led the opposition to it—so that the faithful can judge for themselves. Its purpose is to furnish a detailed chronicle of the "Old Calendar Movement" in Greece and, by extension, America, and to demonstrate that the New Calendar was adopted as part of the larger program of Ecumenism, which seeks to unite the Orthodox Church with all other denominations and even religions, and has brought disaster to those who have participated in it.