Great Question!
Christianity was legalized in the Roman Empire, and was made the official state religion in 380 by Theodosius (the last ruler of the combined Roman Empire). Here's the thing though - that doesn't mean the majority of people followed it.
The truth is that many people would have desired to hang on to their religious roots in the "old gods". However, when it was made the state religion it would have become illegal to not be a Christian. From 380 on Rome was the center of Christianity in the west, so by far the most likely answer is that Nicene Christianity was the dominant religion.
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Christianity was the last "official" religion of the roman empire from about 380 CE until the empire fell (around 475 CE). Before Christianity ruled the empire, the Hellenistic religion dominated, and Christians were punished for their beliefs. After Christianity became the official religion many people who still practiced the Hellenistic religion were persecuted.
It came to an end because they got a lot of Barbarian invasions and the Roman Empire was split in two. In AD 476 the Roman Empire ended. By Nick Andrews
The event which historians consider as marking the end of the western part of the Roman Empire and the beginning of the Middle Ages (not dark ages) is the deposition of Romulus Augustus, the last emperor of the western part of the empire in 476.
Julius Caesar
The sacking of Rome by the Goths and the banishing of the last claimant to the the throne in 476 AD is the date given as the fall of the Western Roman Empire. This also marks the end of Classical Antiquity and the start of The European Middle Ages.
Nunya Business... Okay fine it was 37 AD.