All religions have not killed any people.
As others have so pointedly indicated, people kill people.
Now, some people think money is the root of all evil. Some Hubbers think religion is the root of all evil. But I bet any one of us can think of several examples of killing that have nothing to do with money or religion.
Take for instance the unproven claim that Muslims killed thousands on 9/11. I seriously doubt it. Given the fact that the 3 WTC skyscrapers were brought down by controlled demolition and the fact that it takes weeks or months to prepare such 3 large, highly secure buildings, the only way Al Qaeda could've been involved is for the CIA and the Bush family run security company overseeing the World Trade Center to have had them involved.
No, it's more likely that the power hungry Rockefellers, Goldman-Sachs and Halliburton crowd were behind 9/11 to trick the American public into more lucrative wars, greater loss of liberties (for a false sense of security), and greater excuse to skyrocket the national debt (rapid transfer of wealth from the 99% to the 1%).
Native Americans killed by Christians. I suppose Hitler was nominally religious, but the real culprit behind all of those killings was selfishness (ego).
Perhaps your question and poster (photo) are based upon selfishness (ego). Are you holding onto your fixed idea and trying to cram it down others throats, as so many skeptics accuse the religious of doing with their discussion of religion? Or are you an innocent really trying to understand the ways of the world? I wonder!
Religion is a rescue mission and a body of knowledge of spiritual truth. Creation is superior to the created, not the other way around.