The major deaths/wars attributed to Christianity.
The Crusades: 1-5 million
Albigensian Crusade: 1 million
The Spanish Inquisition: 30,000-100,000
100 years war: 3 million
General religious Mayhem: 10 million
Witch hunts: 50,000-100,000
Persecution of the Waldensians: 900,000
30 years war: 7 million
Ireland: 600,000
Grand total: approximately 17.7 million
Figures taken from http://users.erols.com/mwhite28/warstat0.htm#100yrs
When you compare those numbers to the numbers associated with communism/socialism (100 million) http://www.hawaii.edu/powerkills/COM.ART.HTM
and those killed by abortion (2.5 BILLION) http://users.erols.com/mwhite28/letters.htm#Abor515
you can see that the “unreligious” left is truely far more dangerous to life and liberty then the “religious”.
I agree with the point you are making, but I do have some reservations about your numbers. The Crusades were a last ditch defensive war against an expansive Islamic empire and therefore I believe they shouldn’t be put under the Christianity column, and my second point is that your numbers for the Spanish Inquisition may hold true if you mean all Inquisitions throughout history, though I would still argue that the 100,000 number is an extremely high estimate; however, the Spanish Inquisition itself only executed approximately 3,000-5,000 and was unique in that it was under the control of Spanish Monarchy not the Papacy and though on paper it was a religious inquisition in practice it seemed to be more about consolidating political power.
Sorry about the rambling post, but I just wanted to add my two cents.