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.
Assembly of Canonical Orthodox Bishops of the United States of America
There may be as many as 7,000,000 people who may have been baptized as children and may be married in the church and have their children baptize, though they don't participate in church life, and may be unknown to local churches, though they self-identify as Orthodox. This also includes immigrants to North America who identify themselves as Orthodox, but don't participate in church life. Most studies of religious adherence includes those who self-identify with a religion, but the Assembly of Bishops only recognizes the numbers according to the study by Alexei Krindatch in 2010.