Before Constantine, Christians had been persecuted for 2-1/2 centuries. The Great Persecution was betwee 303 to 311. Christian buildings and homes were torn down and Christians were arrested, tortured, mutilated, burned, starved, and condemned to gladiatorial contests to amuse spectators.<quoted text> Nor is there humanity in radical christianity. You ever heard of the Emperor Constantine and the crusade on Orthodox Christianity? You know how many souls they departed in a short period of time in the name of God? You're 1 track minded & only see things the way you want them to be! True definition of conservatism!
The Great Persecution ended in 311. In 313, Constantine, the Edict of Milan, returned confiscated Church property and granted tolerance to all religions.
By 1200, most of Europe were Christians. Muslims had taken control of Jerusalem in the eighth century and, by the 11th century, Christians were severely restricted or denied passage to the Holy Land.
This led to the Crusades.
Christians and Muslims go way back. But you're confusing Constantine with the Crusades.