LOL! Well-played.
I love it when the Lefties on some forums I'm on start mindlessly bashing Christians for mass killings/wars. They really don't like it when I rub the numbers in their faces. Atheist Leftists have the leaderboard pretty well covered.
The numbers:
http://www.hawaii.edu/powerkills/20TH.HTM
That page only gives Mao's China 35,000,000 dead? I think that's a little low-- I've read his 'Great Leap Forward' was closer to 70,000,000 alone...