Christianity really began to expand rapidly during the reign of the Roman Emperor Constantine (306-337 CE). Before the end of the century, a majority of Roman citizens were Christian, and Christianity officially became the state religion of the empire. Thus, Christianity can be said to have been popularized during the fourth century.
Christianity had a relatively small number of followers in the first century AD, but Christians still are to be found mentioned in the work of the Roman historian of that period, Tacitus.
Christianity was more widely noticed in the Roman world during the second century AD, particularly in the Greek-speaking part of that world.
In the third century, in Anatolia (modern Turkey), Christianity was beginning to win large numbers of followers in certain cities.
In the middle of that century, in an attempt to stem the spread of the Christian cult, Emperor Decius required everyone to confess that they had always followed the traditional gods. His decree probably managed to force most Christians to submit, but Christianity emerged stronger after his death. Other persecutions followed, with similar results. They finally ended in the fourth century with Emperor Constantine believing that the Christian god should not be opposed, but the Christian religion should be given state support.
Later in the fourth century Christianity was the dominant religion, at least in the Greek-speaking half of the empire, but the elite in Rome still largely clung to the old cults.
Meanwhile, Christianity was spreading outside of the Roman Empire, in Persia and its satellites, but it remained a minority movement there.
Roman Catholicism
The most widespread religion on earth is Christianity, followed closely by the Baha'i Faith.
The most widespread religion is Christianity.
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Christianity
Christianity.
Christianity
Christianity
Christianity.
Christianity
The crucifixion cross is the most recognizable Christianity symbol. This is followed by the fish, which was historically the most popular, but is still popular in some sects.