The Roman Empire helped the spread of Catholicism and Orthodox Christianity.
Christianity was preached around the eastern part of the Roman Empire by the apostles and other missionaries. Churches developed and the Patriarchates of Antioch, Alexandria and, later, Constantinople were established. The main kind of Christianity which developed in the eastern part of the Roman Empire was called Greek or Eastern Christianity. Later it came to be called Orthodox Christianity.
Catholicism was initially called Latin or Western Christianity and became the main for of Christianity in the western part of the Roman Empire. It originated from theologists in Roman Tunisia and soon reached italy.
Although Christianity was persecuted by the Romans for a period of time, mainstream Christianity (Greek and Latin Christianity) was made the sole legitimate religion of the empire by the Edict of Thessalonica issued in 380 by the co-emperors Theodosius I and Gratian. The purpose of the edict was to ban dissident Christian doctrines, which were branded as heretic and persecuted. The main target was Arian Christianity, which was popular around the empire.
Paul of Tarsus, who was previously known as Saul spread Christianity as the first Christian missionary, or person who spreads their belief to non-believers. He travelled across the Roman Empire, sending Christian messages to gentiles and non-Jewish communities as well as to Jews. This allowed more people to follow the faith. He preached about Christianity in new areas where no one had preached before, and established Christianity there.
Paul
They built the Vatican.
Christianity
A bible and it actually worked
Kings and Monasteries helped to spread Christianity.
It would be different forms of Christianity. French, Spanish, and Portuguese missionaries would spread Catholicism. British, Dutch, Swedish, Danish, and German missionaries would carry different forms of Protestant faith (such as Anglican, Methodist, Moravian, Lutheran, and Reformed).
The Byzantines spread Orthodox Christianity to those areas.
They were converting the indigenous people to Christianity in the form of Roman Catholicism.
Paul of Tarsus, who was previously known as Saul spread Christianity as the first Christian missionary, or person who spreads their belief to non-believers. He travelled across the Roman Empire, sending Christian messages to gentiles and non-Jewish communities as well as to Jews. This allowed more people to follow the faith. He preached about Christianity in new areas where no one had preached before, and established Christianity there.
Paul
monasticism (as in monstraries were very important)
clovis helped spread christianity by making it the only legal religion
Kings and Monasteries helped to spread Christianity.
Charlemagne helped spread Christianity throughout the Frankish Empire and the lands he conquered. He spread Christianity through both peaceful conversion efforts and military conquests.
Christianity, specifically Catholicism.
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.