I think you are ignoring the fact that secular socialist countries, guided by the science they chose to follow, has murdered more people in 100 years, than all the religions of the world combined have managed to murder over the course of 2000 years.
Religionism “wins” the death count.
Let's see how well the numbers balance down the list, shall we?:
There is no question about Pol Pot - Commie/Authoritarian, no doubt about it.<-- Not religious (and not disputed!)
The Monguls were not Christians or Moslems. If anything their beliefs were more like your Eskimo religion.<-- Religious!
Manchu were possibly believers in Confucianism, but they were just as ruthless as Christians or Moslems.<-- Religious!
Taiping Rebellion was either Buddhism or Confucianism related.<-- RELIGIOUS!
While the Annihilation of the American Indians, might be attributed to Christian, it was in reality a clash of a "Stone Age" culture with one that was moving into the "Industrial Age". <-- NON RELIGIOUS!
Joe Stalin, Mao, a real Communist atheist.<-- Not religious and NOT DISPUTED!
The Mideast Slave trade was run by Moslems, and of course there were ideological perspectives involved as well as a mercantile motive.<-- RELIGIOUS!
The Atlantic Slave could clearly be laid on the hands of Christians.<-- RELIGIOUS!
Timur Lenk was a Turkish Mongul whose conquests rivaled Ghengis Khan. He was not a Christian or Moslem - merely killed lots of them!<-- Not religious, perhaps!
The Kaiser, Archduke Ferdinand, King George, Tsar, and the French were all Christian (but the Turks were Islamic). Although WWII was largely about power and control, Nazism was deeply rooted in christianity <-- Religious!
The Russian Civil War was the Whites (Christians) against the Reds (Atheistic Communist Bolsheviks). Flip a coin, but the Bolsheviks started it! The Czar instituted pogroms against the Jews, <-- Religious!
The Thuggee were a Hindhu cult.<--- Religious!
Rome falls to the pagan Barbarians!<-- "Pagans" had religious beliefs. So did Rome. --RELIGIOUS!
The Thirty Year War involved Christian Europe, again more about power than religion!<--Religious!
The Congo Free State included imperialism and colonialism attributed to a number of European Christian States. It wasn't entirely about religion, however.<-- Religious!
The Chinese Civil War involved atheistic Marxist under Mao, and Buddhists or Confucians under the Nationalist banner. <-- BOTH!
The Crusades<-- Religious!
The moslem rape of the Indian Subcontinent (the Hindu Kush), stands as one of the greatest genocides in human history. Some 80 million people may have been killed <== RELIGIOUS
The moslem conquest of Europe shortly after the death of muhammud, is impossible to calculate. <-- RELIGIOUS!
Any fair tallying of the numbers will put your communist-Marxist ideology in the running for really "evil" category! HOWEVER Marxism, which defines a political ideology, was the prime motivator for Lenin, Stalin Mao, Pol Pot and Kim Jong. Atheism was not a motivating factor in their atrocities.
So tally the score. Religion wins.
What’s important to understand though is that it has always been the religions that have perpetrated the greatest horrors, mass murders and suffering. Look around you though, Its you wonderful religious folks who are suicide bombers, airline hijackers, mass murderers, etc., etc. Hey, it's theists who claim that they have morals of a divine nature to adhere to -- it's theism that claims a "better person" comes from a deep faith. The fact is, it's a sham.