Eastern Orthodoxy by country
Based on the numbers of adherents, the Eastern Orthodox Church (also known as Eastern Orthodoxy) is the second largest Christian communion in the world after the Roman Catholic Church. The most common estimates of the number of Eastern Orthodox Christians worldwide is approximately 200–260 million. The numerous Protestant groups in the world, if taken all together, outnumber the Eastern Orthodox, but they differ theologically and do not form a single communion.
Eastern Orthodox Church
The Eastern Orthodox communion is organized into several regional churches, which are either autocephalous ("self-headed") or lower ranking autonomous (the Greek term for "self-lawed") church bodies unified in theology and worship. These include the fourteen autocephalous churches of Constantinople, Alexandria, Antioch, Jerusalem, Georgia, Cyprus, Bulgaria, Serbia, Russia, Greece, Poland, Romania, Albania, and the Czech Republic and Slovakia, which were officially invited to the Pan-Orthodox Council of 2016, the Orthodox Church in America formed in 1970, the autocephalous Orthodox Church of Ukraine created in 2019, as well as a number of autonomous churches. Each church has a ruling bishop and a holy synod to administer its jurisdiction and to lead the Orthodox Church in the preservation and teaching of the apostolic and patristic traditions and church practices.