Question

During what period did Christianity spread to Spain?

Answer 1

During Roman times. Christianity was already present in pretty much every major city of the Empire by the time Constantine converted and legalized the faith in 313. Spain probably became majority Christian during the fourth century, when Christianity first became legal, and later, the state religion of the Roman Empire.

Answer 2

Christianity first came to Spain with Jews who fled the wars in Jerusalem during Roman times. The first written instances are from the year 115 AD. The real momentum to spread Christianity in Spain came after the second century when Jews and Christians started to settle in Spanish cities and began to convert their neighbors. The earlier Christians continued following the Jewish practices while others followed Gnosticism. One writer from North Africa claimed that in 200 AD there were Christians all across Spain.