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.
Christian denomination
The Eastern Orthodox Church, with an estimated 225–300 million adherents, is the second-largest Christian organization in the world and also considers itself the original pre-denominational church. Unlike the Catholic Church, the Eastern Orthodox Church is itself a communion of fully independent autocephalous churches (or "jurisdictions") that mutually recognize each other to the exclusion of others. The Eastern Orthodox Church, together with Oriental Orthodoxy and the Assyrian Church of the East, constitutes Eastern Christianity. (There are also some smaller groups of Eastern Catholics which are in communion with the Bishop of Rome but have cultural and historical ties with other Eastern Christians and Byzantine Lutherans were newer group of Eastern Christianity and Protestant Lutheranism in Ukraine and Slovenia that accepts Byzantine Rite as the denomination's liturgy while retaining their Lutheran traditions.) Eastern Christian denominations are represented mostly in Eastern Europe, North Asia, the Middle East, Northeast Africa and mostly South India.