If you're going to argue about whether Christianity does more harm or good, you can't weed out all of the people you have deemed not to be true Christians. When people believe they are acting under the authority and values of Christianity, regardless of whether you agree that they are or not, that falls under the scope of harm done by Christianity. Christianity as a whole is responsible for how its message is transmitted, and if someone misinterprets that message, Christianity is still responsible for the actions that result from that due to the lack of clarity of the message. In other words, you can't simply ignore the harm someone does in the name of Christianity even though you don't agree that person truly understood the Christian message.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell
