It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church.
The Catholic Church is the only true Church which was established by Our Blessed Lord, Jesus Christ, guaranteed by Him, and guided by His Holy Spirit. He set St. Peter and his successors over it as His vicar to guide it on earth. It preserves the entire teaching of the Lord and His Apostles, and He personally guaranteed that it would remain ONE, HOLY, CATHOLIC, AND APOSTOLIC, until the end of the world. It cannot err in matters of faith and morals.
The Eastern Orthodox Christians are a group of national Churches that were founded individually in the 12th century from those Eastern Rites which left the Catholic Church at that time, and have been ruled by their respective governments. They have lost the guidance of the Holy Spirit, from that time, and, aside from the fact that they maintain a valid priesthood and sacraments, they have lost communion with the one Church of Christ, and have been insular, national churches on their respective countries (witness the Russian Orthodox Church).
For a very thorough discussion of the status and scope of the problem please read Vladimir Soloview's The Russian Church and the Papacy, which addresses all these problems, and the dire straits that the Eastern Orthodox Churches are in right now. (Please see link below, as of my writing of this, Catholic Answers is offering this book for $2!) Please note that there are Eastern Rite Catholics, for nearly every Orthodox Church, who have remained in Communion with Rome and are still genuinely Catholic.
They are called Eastern Orthodox Christians or just Orthodox Christians.
The Orthodox Churches and the Catholic Church were once united. The Orthodox Churches separated from the Catholic Church over political and doctrinal differences.
The Roman Catholic Church and the Eastern Orthodox Church split in 1054 due to disagreements over the authority of the Pope, theological differences, and cultural and political divisions.
The catholic church is sometimes considered the collection of churches that developed out of the Great Schism (namely, the Roman Catholic Church and the Eastern Orthodox Church). Although I have never heard someone use the term "catholic orthodox church," I would consider it to be referring to the Eastern Orthodox Christian religion.
The Eastern Orthodox Church split from the Roman Catholic Church in 1054 due to disagreements over the authority of the Pope, theological differences, and cultural and political divisions between the East and West.
The term "catholic" is claimed by both the Roman Catholic Church and the Eastern Orthodox Church. The Roman Catholic Church includes all the Churches that accept the authority of the pope in Rome, including certain Eastern Churches. The Eastern Orthodox Church does not accept the authority of the pope in Rome. The pope is the spiritual leader of all Christians. However, the Protestants and Orthodox do not recognize that leadership.
the Eastern Orthodox Church and the Roman Catholic Church
In Croatians are Catholic Christians, Serbs are Orthodox Christians, Bosnian are mostly muslims, Macedonians are Christians like Bulgarians and Romanians, in Greek we have Orthodox and Catholics Christians, Montenegrians are Christians and Slovenians there are Christians and there is muslims. I think so ;)
I'm pretty sure that the larger amount of Christians in Russia are Eastern Orthodox Christian with some amount of born-again Christians.
Eastern Orthodox
Anyone other than Eastern Orthodox eg Oriental Orthodox, Catholic, Protestant
The Great Schism, also known as the East-West Schism, was caused by a combination of theological, political, and cultural differences between the Roman Catholic Church in the West and the Eastern Orthodox Church in the East. These differences ultimately led to a split in 1054, dividing Christianity into the Western (Catholic) and Eastern (Orthodox) branches.