Whether this is true or not, so what?
It is true that people have killed in the name of Christianity but Christianity wasn't the cause, the bastardization of Christianity of some people is the cause. Jesus said love your neighbors like yourself and if people would follow that then war and genocide would have never been carried out in the name of Jesus or Christianity.
This is something I found that speaks to some of the discussion. I won't call it all inclusive nor completely accurate just food for thought.
Deaths Caused by Christians:
1562-1598 – French Wars of Religion – France – 4 million
1095-1291 – Crusades to the Holy Land – Middle East, Spain, Africa – 1.5 million (This does include all sides of the conflict)
1184-c. 1860 – Various Christian Inquisitions – Europe – 17,500
6 million deaths caused by Christians.
Deaths caused by non-Christians:
184-205 – Yellow Scarves Rebellion (Taoists) – China – 7 million
1300s-1521 – Human Sacrifices (Aztecs) – Mexico – 1 million
1855-1877 – Panthay Rebellion (Muslims) – China – 12 million
1932-1933 – Holodomor (communist atheists) – Ukraine – 10 million
1941-1945 – Nazi Genocides (statist atheists) – Germany – 11 million
1959-1962 – Great Leap Forward famine (communist atheists) – China – 43 million
1971 – Bangladesh Atrocities (Islamists) – East Pakistan – 3 million
1975-1979 – Khmer Rouge Repression (communist atheists) – Cambodia – 3 million
September 11, 2007 – Terrorist attacks (Muslim Jihadists) – USA – 5,000
The deaths caused by non-Christians – approximately 90 MILLION!