Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
Through most of their history the ancient Romans had their own religion: Roman Religion. In the Later Empire Christianity spread in the Roman Empire, was endorsed by the Roman emperors and became state religion.
Catholicism
The Romans spread two different religions: pagan religion and Catholicism. In the early days of the Roman empire, they spread pagan Roman religion that is usually referred today as Roman Mythology. In 312 AD, Emperor Constantine converted to Catholicism, and made it the state religion in 313. After that point Catholicism was spread by the sword across the Roman Empire. This practice continued until the fall of the Roman Empire, and was picked up by most of the kingdoms that rose out of that collapse. The general way of spreading religion within the Roman Empire, and even more so by the governments that followed the fall of the Roman Empire, was if you did not convert to Catholicism, you died.
It was Chrisitanity
The Roman Empire made Christianity the official religion of the Empire, and 'encouraged' the peoples it conquered to convert.
No religion helped to save Roman culture. One religion spread through the Roman Empire in its later days and transformed Roman culture: Christianity.
That would be Christianity.
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No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.No, Christianity was brought to Europe by the disciples of Christ. The Roman empire served as a vehicle for the spread of the religion due to its peace, good roads, safe travel and the Roman tolerance for foreign cults.
Please specify which new religion you are referring to. several new religions spread in the roman Empire
Roman religion died out nearly 2,000 years ago and we do not use it today. What we have inherited form the Romans are Catholic and Orthodox Christianity. Christianity spread around the Roman Empire and developed into the Catholic and Orthodox creeds in the Roman days. The former was the religion of the western part of the Roman Empire and the latter was the religion of the eastern part of the Roman Empire.