Christianity has indeed been the banner of many people who did unspeakable evil. But, I think you stretch a little to far here.
One thing about Christianity that is a net positive is that it recognizes that human beings have inherent value that are not derived from the government or status or wealth. Christianity is not the only belief system that supports that, but it is a very important belief when it comes to government.
Men have rationalized a lot of really evil oppression in the name of Christ or Christianity, but you can't really justify a government that treats its citizens like cattle. The worst atrocities in the history in Christianity are arguably related to the conquest of the Western Hemisphere, where the natives were treated as sub-human. The American practice of slavery was and is obviously evil.
But here, you overstate:
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they are on par with the rest of humanity that is equally guilty of those things.
There are indeed sectors of humanity that are much, much more guilty of being evil than any Christian nation, and most other non-Christian nations in the history of humanity that were not similarly evil.
I am not aware of a Christian nation that treated its own citizens as if they had no inherent worth, like you see in the CCP, Pol Pot's Cambodia, the USSR and Ukraine, or Nazi Germany.
It is also fair to say that world-wide, the mores around the world related to war are much less brutal than the time period before Christ. It is disingenuous to disregard the impact of Christianity on this gradual change in world-wide mores.
The truth is probably somewhere between your point and the point you were arguing against. I firmly believe that out of the crooked timber of humanity, no straight thing was ever wrought. That includes human institutions related to Christianity. These institutions are all going to be fallen in some fashion, because they all rely on the support of fallen men (to be explicit, most flavors of Christianity would describe all men as fallen, none perfect).
But I still find Jesus Christ to be the most impactful human being (even if you believe he is nothing more than myth) in the history of the world, and a force for good. I think that to argue against that is a bit myopic.
I would say that Buddha is probably number 2 on the list. While I don't agree with Buddhist theology or philosophy (depending on your flavor of Buddhism), I find that the religion is on net a force for good for humanity. Same with the Sikhs and Mormons.
It takes a special kind of brainwashed useful idiot to politically defend government fraud, waste, and abuse.