the Other Wiki if you want all the gorey details. No Pope (one of the main reasons for the split, and the biggest obstacle to reunification in the present); the church is instead led by several Patriarchs, each responsible for a different region. Cyril I is the current Patriarch of the Russian Orthodox Church, by far the largest church, but the Ecumenical Patriarch of Constantinople (currently Bartholomew I) is considered "first among equals". Married men can become priests, priests' wives are important in the church. Some jurisdictions follow a different calendar from the Catholic church (the Julian calendar, originated in Ancient Rome, which is considered the "holy calendar"), thus Christmas takes place January 7th. Others use a Revised Julian calendar that is almost exactly the same as the secular calendar (but will diverge at some point in the future); however, almost all of those churches still calculate Easter and related holidays according to the old calendar (yes, it's complicated). Easter ("Paskha") can be up to several weeks after Catholic Easter—or it can be on the very same day. This derives both from the difference in calendar and by being determined by a different method. The look-and-feel of the religion is very similar to Catholicism, much more than to Protestantism: there are bishops, monks, nuns, saints and other pre-Reformational trappings. Church services have lots of chanting, gold vestments, incense, candles. But the liturgical languages are Greek, Old Church Slavonic or the national language of the country the particular Church is from (e.g., Japanese in Japan, English in the US, etc.) and the spirituality is decidedly more "Eastern" than western churches (see Hesychasm for an example). Orthodox Christians make the sign of the cross up-down-right-left, whereas Catholics go up-down-left-right; in some spy stories, a westerner might give himself away by crossing himself the wrong way while saying grace. And while there are monks and nuns much like in the Catholic church, you might not recognize them. Monks usually wear black robes and have very long, and sometimes unkempt, beards and hair (taking too much care of your appearance is seen as earthly vanity); think "hippie" or "hermit" instead of "Friar Tuck". And nuns are usually draped head-to-toe in black,◊ with their heads covered; you're likely to think you're looking at a fairly conservative Muslim woman. This religion has strong historical ties to the Eastern Roman Empire, which is why a good deal of the religion is centred on historically Greek areas (Alexandria, in Egypt, for instance), and beyond Russia the religion is predominant in much of the Balkans including Greece. There are also "Eastern Catholic" churches, which look and smell like Orthodox churches, and have many Orthodox practices (including even married priestsnote ), but are in communion with the Roman Catholic Church and accept the Pope's authority (and thus run on the Gregorian calendar and celebrate festivals on the Catholic dates). The Ukrainian Catholic Church is one of the largest and best known of these.note Some older literature might call these Eastern Catholic churches "Byzantine Catholic" or "Uniate"; the latter term is generally considered offensive, while the former is merely considered archaic and sometimes inaccurate (as most but not all Eastern Catholic churches use the Byzantine Rite). Note about married priests: a married man may become a priest, but a priest may not marry. Thus, while a married man can continue to live with and have marital relations with his wife (subject to fasting restrictions), he cannot take a wife after he has been ordained, regardless of whether or not he was married when ordained. The same rules apply to Catholic deacons and the rare instances of married Latin Rite Catholic priests. Additionally, a married man may not become a bishop; as a result, Orthodox bishops are frequently former monks rather than former parish priests, although obviously this isn't a complete rule. Orthodox Christianity is very influential in modern Russia, and has strong ties with the government. This causes controversies not unlike the American debates of creationism vs. evolution and pro-life vs. pro-choice, with the church firmly standing on the former side. It is also heavily in opposition to the LGBT rights cause.
Oriental OrthodoxyA communion of Churches who consider themselves Orthodox and differ from the Eastern Orthodox because of their Christology (i.e. their beliefs about the nature of Jesus Christ). They are also known as the non-Chalcedonian churches, as they reject the Christological dogma promulgated by the Council of Chalcedon (about which see more below). These churches are the Coptic (i.e. Egyptian), Armenian, Syriac, Ethiopian, Eritrean and Indian churches. The largest of these is the Ethiopian Orthodox Tewahedo Church, currently headed by Patriarch Abuna Mathias. Much as the Eastern Orthodox churches are in full communion with each other and recognize the Patriarch of Constantinople as first among equals, the Oriental churches are also in full communion with each other and recognize the Patriarch of Alexandria (who resides in Cairo these days, confusingly enough) as first among equals. This is despite the fact that the Patriarch of Alexandria's title is "Pope," but he doesn't seem to mind. The current Coptic Pope of Alexandria, Theodoros II, was selected on 4 November 2012 by a process involving a series of consultations among Coptic clergy and laity to narrow the field down to three candidates, after which the Pope is chosen by literally having a blindfolded child pull one of the three's name out of a hat (or some other vessel). The previous Pope, Shenouda III, died in March 2012. He had gained accolades for his campaigns for Christian unity but also caught a bit of flack (though not too much) for backing the wrong side in the early days of the Egyptian Revolution of 2011 (it was understandable—it wasn't immediately clear that the rights of Christians would be respected; Coptic revolutionaries were nevertheless understandably pissed off at their Pope for a while). Their Christology, referred to as miaphysitism, says that Jesus Christ has one incarnate nature that is both human and divine. The Chalcedonian formula is that Jesus had a human nature and a divine nature in hypostatic union. When the split occurred, Christology was Serious Business (people were occasionally killed in the schism). Today, the differences (particularly in the face of Protestantism) appear rather picayune. (Larry Gonick joked that the dispute between the Eastern and Oriental amounted to one saying "It says in [such and such bit of scripture] that the Lord's Enemy—namely YOU—smells like rotten eggs!" and the other saying, "Strangely, I agree verbatim..."). Recently leaders of the two churches have stated that both definitions are merely two different ways of saying the same thing and there is hope that there will be reconciliation. Some at the time of the original Monophysite Controversy—when miaphysitism was first proposed as a compromise between hardline monophysitism and the Chalcedonian line—realised this, but by that point the argument had gotten so calcified that nobody was willing to listen.
DvoyeveriyeDvoeveriye (Russian for "Dual Faith") are semi-pagan old Russian syncretic mystery cults which formed after the forced Christianization of Kievan Rus. In these cults, old pagan gods from Slavic Mythology were worshipped under names of Christian saints. For example, Perun, the god of thunder, was renamed into Elijah the Prophet (Ilya Prorok), and Veles, the god of the underworld, wealth and cattle, was worshipped as St. Blaise (Svyatoy Vlasiy). Dvoyeveriye cults were very pervasive and popular among peasants who didn't understand proper Christian theology; some rudiments of them remain even now in the Russian folk-Christianity. The page Slavic Mythology has more information on what god hid under what saint's name.
Starovery, or the Old BelieversThe Old Believers are a number of Russian Orthodox Christian sects that started in the 17th century after a particularly ill-understood religious reform by Patriarch Nikon. These sects, mostly ultra-conservative and reclusive, formed communities in Siberia and other remote areas of Russia, and some of them moved then far outside it, similar to the American Mormon or Mennonite communities. Many of them still exist to this day.