Well, guesses and informed choices have been flooding in all weekend. Here, to save bandwidth, is the solution:
(a) Alexander the Great
No. Probably would have killed them if there were any around. Alexander would have killed Japanese teenage school girls and Swedish supermodels who got in the way. In fact, Alexander managed to kill more Greeks than anyone else did, until that time. He was also hell on Persians, Indians, proto-Afghans, Mesopotamians, Jews, Egyptians, and well, you get the point. Did manage to make the Afghans part of the Hellinized world for a short time.
(b) Pope Innocent III
(c) George H.W. Bush
Nope. Kept casualties pretty low in Gulf War I.
(d) George W. Bush
Okay. Here's where it gets tricky. Likely casualties in Iraq have been in the 50,000 range. Calculating losses in Afghanistan gets tricky because there was already a civil war in the north of the country and deadly repression elsewhere, in September, 2001. Pick the high side of estimates, and deaths total about 75,000. Discarding the fantasies of the far left, and figure of 150,000 is the absolute high end. So far.
(e) Joseph "Uncle Joe" Stalin
Ah, the big leagues. Hard to know, really. Stalin deported many Muslim groups to Siberia (setting the stage for recent ethnic troubles). Being a Georgian, he had a strong cultural bias against Caucasian Muslims. His regime may have killed, directly and through neglect, one million Muslims, but that may be an over-estimate. One thing working in the favor of Soviet Muslims: most fighting in World War II took place to the north and west of their homelands.
(f) Heinrich Himmler
No way. Himmler loved Muslims and set up an SS Muslim brigade, manned by volunteers recruited by the Grand Mufti of Jerusalem. They were the only SS unit to wear fezes.
(g) Saddam Hussein
Back to the big leagues. Diplomats in Baghdad say at least one million died in the Iran-Iraq war. Then there were the Marsh Arabs and various Kurd and Sunni Iraqis that suffered genocide, plus the Iraqi losses in the Kuwait campaign, pushing Saddam's numbers far above Stalin's.
(h) Moshe Dayan
Nope. Israeli general. Great tactician, but no murderer.
(i) John II Monologue of Byzantium
I made him up.