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, with the most common estimates of baptised members being approximately 220 million.[1][2][3] The numerous Protestant groups in the world, if taken all together, substantially outnumber the Eastern Orthodox,[4] but they differ theologically and do not form a single communion.[5]
^Brien, Joanne O.; Palmer, Martin (2007). The Atlas of Religion. Univ of California Press. p. 22. ISBN978-0-520-24917-2. There are over 220 million Orthodox Christians worldwide.
^Jay Diamond, Larry. Plattner, Marc F. and Costopoulos, Philip J. World Religions and Democracy. 2005, page 119.(also in PDF fileArchived 2008-04-13 at the Wayback Machine, p. 49), saying "Not only do Protestants presently constitute 13 percent of the world's population—about 800 million people—but since 1900 Protestantism has spread rapidly in Africa, Asia, and Latin America." "Archived copy"(PDF). Archived from the original(PDF) on March 25, 2009. Retrieved 2013-07-03.{{cite web}}: CS1 maint: archived copy as title (link)