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.
Oriental Orthodoxy
According to the Encyclopedia of Religion, Oriental Orthodoxy is the Christian tradition "most important in terms of the number of faithful living in the Middle East", which, along with other Eastern Christian communions, represent an autochthonous Christian presence whose origins date further back than the birth and spread of Islam in the Middle East. It is the dominant religion in Armenia (94%), the ethnically Armenian unrecognized Nagorno-Karabakh Republic (95%) and in Ethiopia (43%, the total Christian population being 62%), especially in two regions in Ethiopia: Amhara (82%) and Tigray (96%), as well as the capital city of Addis Ababa (75%). It is also one of two dominant religions in Eritrea (50%).