As far as I know, in the late era of Roman emperors, people had their way to do anything, and they did (remember, it was the age of Caligula, Nero, and peacock feather to make you vomit so you can eat more, then repeat, and I will not go into details about the sexual liberties).
And, as it happens many times in history when people do something to the extremities: they got sick of it, and wanted something better, something new. And in this situation had arrived a religion of love and of some very strict expectations (eg. offering your other cheek), after a long time of moral chaos. So it started to spread, even though it was a forbidden religion first. But when martyrs die for what they believe, you start to wonder, why they do it.
Later, Constantine the Great had his reasons to make this the official religion of the Roman Empire, which was helpful, too.
But I'm relying on some memories from history classes, and the novel "Quo Vadis", mixed with some personal guesses, so if you need more, there's plenty to research.
Continuing AnswerYou could check out some other questions around the same theme:See links to these in the related questions listed below.
Christianity did not easily spread through the Roman Empire. See the related question, "How did Christianity spread throughout the Roman Empire?"
1018
By 325ad Christianity had spread throughout the Roman Empire and to Britain. If you google "spread of Christianity map" you will find maps showing the spread.
Constantine
There was not one person who spread Christianity throughout the Roman empire. Christianity began its expansion by the efforts of the original apostles and Paul. These men gained followers who in turn gained followers and the movement snowballed.
The Romans who remained pagans did not contribute to the spread of Christianity Neither did Julian, who was the only pagan emperor in the Later Roman Empire
The apostles and Paul traveled throughout the region teaching others.
There was no single person who spread Christianity throughout the empire. Each one of the apostles of Jesus went to different areas to preach. Paul also did a lot of writing and traveling and converting.
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The roman empire itself. But disciples like Paul assisted in spreading the gospel.
A:More than anything, the spread of Christianity can be attributed to the success of the Roman Empire, with the enforced conversion of pagans to Christianity throughout the empire, then the success of the Holy Roman Empire under Charlemagne, the forced conversion of Russia to Christianity and finally the spread of colonialism to the New World.
More than anyone before him, Emperor Constantine spread Christianity throughout the Roman Empire. True, Christianity was already well established, especially in the Greek-speaking east, long before the fourth century, but Constantine gave the religion state patronage, offered career preferment to those who claimed to be Christians, and began the long persecution of the pagan temples. From this time, and with this impetus, Christianity spread quickly in the Roman Empire.