Christians are a bunch of heretics going around killing other religions

Some people are against Christianity because of this reason. An example quoted are the crusades killing Muslims and Jews in the name of claiming back Jerusalem the holy city for pilgrims. Yup I'll totally agree that its disgusting.

However implicit in that statement is a factual error. We ignore the fact that atheists has killed many more. Stalin has killed 50 millions in the name of socialism. Hitler has ordered exterminations of Jews in the name of "The Final Solution". The Germans at that time were the most educated amongst nations, are we then to say that they're a bunch of Jew killing intellectuals?

We should not judge a philosophy by its abuse.