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.
Religion in Greece
The Greek Orthodox Church, a member of the Eastern Orthodox Communion, is accorded the status of "prevailing religion" in Greece's constitution, and Greece is the only country in the world where an Eastern Orthodox Church is clearly recognized as a state religion. Since 1850, Greek Orthodoxy within Greece is handled by the Church of Greece. Its members comprise between 88% and 95-98% of the population, the most recent Pew report gave a percentage of 90% as 2015 numbers.