The Ancient Roman religion, before they came to believe in Jesus Christ, doesn't have a name. They believed in numerous gods and believed in earthly cycles. They were incredibly close to nature. They had gods for love, earth, war, craftmanship etc.
Roman religion
The religion of ancient Rome was Roman religion.
The dominant religion in the Roman Empire was the Roman religion until Christianity became the dominant religion.
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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.
The Ancient Romans who lived in Italy had the Ancient Roman Religion, it was polytheistic and didn't have an official name.
The Roman Emperor Nero was raised in the Roman pagan religion, but he eventually turned against it and persecuted Christians in the Roman Empire.
The Greco-Roman Religion.
The overseer of Roman religion was the pontifex maximus, the chief priest.
they studied Christianity after they were conquered
Roman religion was basically Latin religion and some of its rites predated the foundation of the city. Early Roman religion was also influenced by Sabine religion and Etruscan religion. As the religion evolved, there was an increasing influence from Greek religion and myths.
Ancient Helenism. Wiccans also worship Greek/Roman gods too.