The Crusades.
Human history has been built on the ability of people to kill each other, over the last two thousand years one Genocide after another has followed many in the name of religion.
Religion must be seperated from faith, religion is about keeping rituals and legalism! Where faith is about a personal relationship with Jesus and trusting God to provide.
The Christian Crusades of the Roman Catholic Church was the first attempt to unify Christian Europe, since the fall of the Roman Empire in 350AD. The Islamic Conquest of the Holy lands was the spark or the excuse to introduce the Apocalyptic end of the world. Instead it lead to the butchery of many Christians in Hungary wo refused an alliance with the Pope.
Jews living in Germany suffered the first Holocaust and fled to the russian steppes, while more ordinary, muslim and jewish folks were murdered in the name of Jesus in Jerusalem.
Deuteronomy 18:22, Jeremiah 20:6, John 10:33, Galatians 5:16, Ephesians 4:14.
Ask me and I will tell you! 