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There is only one Lent in the Malankara Orthodox Church in India, which is known as the Great Lent or the 50-day Lent. It begins on Clean Monday and ends on Great and Holy Saturday, just before Easter Sunday.
They are the Greek Orthodox Church, one of the many branches of The Orthodox Church.
No. Not by many, many years
The Orthodox Church has seven sacraments: Baptism, Chrismation, Eucharist Confession, Holy Unction, Marriage, and Ordination
The Catholic Church has a pope as well as the Coptic Orthodox Church.
About 350 million.
33 including the katholikos
Some statistics mention that there are about 225-300 million Christians in the Eastern Orthodox Church worldwide.
A: There are many differences between Greek Orthodox Church and Russian Orthodox Church, so posing the question that broadly is meaningless. Regular Christianity is too heterogeneous if at all useful notion.
There is one Orthodox Church. Many of the parishes of the Orthodox Church happen to be Greek, especially in Greece. ... The Orthodox Church has a similar structure to the Catholic Church. Churches are divided mainly on ethnic groups, without any differences on belief. They have autonomy but they are all (spiritual) subjects of the Patriarchy (the father Church) located in Istanbul. The Patriarch is like the Pope. Almost all of the churches are dedicated to a saint.
Your question is too general. There are many things that were not a cause of tension between these belief systems. The colour of my dog for instance
Many.Ill explain the history of the church briefly. There was one church called "The Catholic Orthodox Church".It consisted of the Roman church ( found by st.peter),the Greek church (founded by st.andrew),The Coptic church (founded by st.mark),The church of Antioch (not sure founded by who) and The church of Jeruslem (not sure founded by who). It split into Catholic and Orthodox.Catholic "west" and Orthodox "east'.However the Coptic church belongs to the Eastern "Oriental' Orthodox church while the Greek church belongs to the Eastern Orthodox church,they are the same but have a different view on the divinty of christ.The Coptic church believes christ has two natures but united while the Greek church beleives christ has two natures but seperate. After that The western church - the Catholic church had many splits these churches are called Protestant churches which consists of anglicans,baptists and so on. The differences are many, too long to list