How did Christianity begin in Europe?

Answer 1

A:We know that by the time Paul wrote his Epistle to the Romans there was already a thriving Christian community in Rome. We do not know how the first Christians arrived in Rome so quickly.

Answer 2

It all began with the Roman conquest of Europe between 43 and about 410 AD. In the early years of the conquest, Rome was mainly pagan, and often very anti-Christian. However, when Emporer Constantiene came to power in the 4th century AD, he began christianizing Rome, and therefore, all the land owned by Rome, which at that time, included much of Europe.