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This all reminds me of the gun lobby thing. Guns don't kill people. People do. Religions don't persecute non believers. Individuals from that faith do. I try to take a step back from this perspective and say the more religious a cultures is, the more religious killers the culture will produce. The more guns are available, the more innocent people will die from guns shots.
From Wikipedia: "...In terms of demographics, India ranks as the country with the largest number of highly religious people in the world, with an estimated 960 million to 1 billion believers. China, although its number is less than a fifth of its total population (~18-19%), ranks second, with an estimated 240-260 million believers, followed by Indonesia (~235 million), the United States (~205 million)..."
Do India's, China's, Indonesia's, and the United State's religious persons account for the highest percentage (relative to other cultures) of, as you say, "religious killers"? (I'm asking. I don't know the answer, although I suspect they do not.)
I think that we need to get over the idea that all religions are equally problematic, especially when the evidence slaps us in the face, over and over again, that this is not the case.
Despite my assertion about Islam, I am an honest to Darwin, liberal, progressive, humanist. I wish peace and prosperity for all Muslims as I do for all humans. But it is clear to me, that of religions, in today's world, Islam is the most F'd up, in terms of its doctrines being easily interpretable in ways that actually (not just in theory) but actuallylead to the most despicable violent acts and the most onerous oppression of human rights, around the world.