Question

How did christianity expand​

Answer 1

By the beginning of the Nicene period, the Christian faith had spread throughout Western Europe and the Mediterranean Basin, and to North Africa and the East. A more formal Church structure grew out of the early communities, and variant Christian doctrines developed.

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Answer 2

Answer:

The Roman Empire officially adoptedChristianity in AD 380. During the Early Middle Ages, most of Europe underwent Christianization, a process essentially complete with the Baltic Christianization in the 15th century.