Prove that Christianity, or whatever religion you pick, has not been responsible for more bloodshed and war than any other social force in history.
Well, that is one that is quantifiable, and easy to prove. Psac provided a source:
If you want numbers and stats, you can read "the irrational atheist" by Vox Day.
Regardless of whether you agree or disagree with his views, he does show STATS and Numbers.
http://www.miller-mccune.com/culture/myth-of-the-modern-religious-war-34617/
To determine whether any of these authors are on the right track, my students and I looked at Kalevi J. Holsti’s 1991 book Peace and War: Armed Conflicts and International Order, 1648-1989. Holsti analyzes all international conflicts over the last several centuries, classifying the issues of conflict.
In looking at religious wars in Holsti’s time frame, we coded all cases involving any religious component, from unification and irridenta to protecting religious confreres, and identified 16 religious wars.
More than half of them were between the Ottoman Empire and European nations (1600s-1800s) over protecting Christian pilgrims on the way to the sites in the Holy Land. These were one-way disputes, with the European Christian country pursuing claims while Turkey didn’t seem to have a problem with the status quo. For those since World War II (India-Pakistan, Israel-Arab, Biafra-Nigeria and Syria-Lebanon), none, according to Holsti, had religion as the primary rationale for fighting, even if the wars were advertised as such.
To establish a baseline for comparing religious conflicts with other reasons why countries fight, we gathered information on three additional issues where Holsti collects data: real estate (territorial disputes), riches (battles over resources), and regimes (where one country attempts to replace another country’s government with one it prefers). Like the religion analysis, this involved bundling several of Holsti’s issues under a broader category for each issue of conflict, since many if not most wars have multiple issues. The results are listed below: