Question

How did Christianity expand?​

Answer 1

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.

Answer 2

Christianity began as a Second Temple Judaic sect in the 1st century in the Roman province of Judea, from where it spread throughout and beyond the Roman Empire.