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orthodox Christianity
Christianity developed from a religion among a small group of Jews (who lived in Judea, which was part of the Roman Empire) into a mass religion in the Roman days. It spread around the Roman Empire. It became state religion. Catholic Christianity and Orthodox Christianity developed during the Later Roman Empire. They were originally called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the main form of Christianity in the western part of the Roman Empire and the latter was the main form of Christianity in the eastern part of the Roman Empire.
Orthodox Christianity.
I would say religion was the ancient Romans' most significant contribution to Europe. Christianity developed from a religion among a small group of Jews (who lived in Judea, which was part of the Roman Empire) into a mass religion in the Roman days. It spread around the Roman Empire. It became state religion. Catholic Christianity and Orthodox Christianity developed during the Later Roman Empire. They were originally called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the main form of Christianity in the western part of the Roman Empire and the latter was the main form of Christianity in the eastern part of the Roman Empire.
The Europeans and their descendants elsewhere are Christian because of the Roman Empire. Judea was a province of the Roman Empire in Jesus Christ and the Romans crucified Jesus. Christianity spread around the Roman Empire, became the religion of the masses in this empire and then mainstream Christianity became the state religion of the empire. What was to become Catholicism spread and developed in the western part of the empire and was originally called Western or Latin Christianity. The Popes became its heads during the Roman days. Orthodox Christianity spread and developed in the eastern part of the Roman Empire. Originally it was called Eastern of Greek Christianity. The Patriarchs of the Orthodox Church already existed in the Roman days.
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There was only one Roman Empire. Moreover, the Roman Empire did not study Christianity. An empire cannot study. The Roman Empire was where Christianity spread from Judea (which was a part of the Roman province of Syria). Both Catholic and Orthodox Christianity developed in the Roman Empire. Originally the were called Latin or Western Christianity and Greek or Eastern Christianity respectively. The former was the dominant form of Christianity in the western part of the Roman Empire and the latter was the dominant form of Christianity in the eastern part of this empire. There were also dissident Christian doctrines and sects.
Christianity was more than just famous throughout the Roman Empire. It spread and developed in this empire. Christianity started in the Roman Empire. Judea was part of the Roman province of Syria (that is, a province of the Roman Empire). The apostles and later Christian missionaries travelled around the empire and converted many people. The Christian churches developed in the Roman Empire. Christianity became a major religion of the empire and eventually became the state religion of the empire. Both the Catholic Church and the Orthodox Church were originally churches of the Roman Empire. The former was originally called Latin or Western Christianity and was the main version of Christianity in the western part of the empire. The latter was originally called Greek or Eastern Christianity and was the main version of Christianity in the eastern part of the empire.
When Constantine converted Christian, then Christianity became a state religion for the Roman Empire.
Romans
The British.
Christianity is the contribution of the Romans to religion. Christianity spread around the Roman Empire and eventually became state religion. Both Catholic and Orthodox Christianity originally developed in the Roman Empire.