Now I have to be careful that I don't imply there is anything like that in Islam. I mainly just want to make the point that religions can be condemned. Certainly the behavior of the Christian crusaders at many points in that history can be condemned, and it was all endorsed from the highest to the lowest levels of Christendom.
Islam is an example of a "meme" (a word that had a lot of popularity a few years ago but seems to have fallen away, but that I think forms a useful way of thinking). A meme is a system of thought that is self-perpetuating, like a living thing is self-perpetuating. It has aspects in its belief system that help it propagate and help it survive. There is competition among memes, and those with the most effective teachings and behaviors tend to persist and grow while those without them don't.
What is good for the meme however is not necessarily what is good for its adherents nor for humanity in general. Warlike and intolerant behavior tends to be good for the meme, and harmful otherwise. The Buddhist tendency to encourage young men to crawl into a monastery and study their toenails is good for many people of a certain personality, but not good for either humanity nor Buddhism, while getting these same devotees to go out and live happily and productively helps both humanity and Buddhism.