It spread all over mainly because of mouth, preaching.
Christianity
clovis helped spread christianity by making it the only legal religion
Christianity
Christianity
over a boat
The Pax Romana did not promote the spread of Christianity. It was a period of relative political stability in the empire and was not connected to religion. At the end of this period, Christianity was still a small religion with a limited following.
Christianity, which they spread to the Near East during the Crusades.
Christianity became the main religion of Spain during the Roman days. Christianity spread around the Roman Empire and became its main religion
Christianity
christianity
Christianity
If we take time as a measure of the spread of religion,then since its establishment ,Islam is the religion which spread or still spreading rapidly in Asia followed by Christianity.