The way I see it, Islam is about 500 years newer than Christianity. If you look at what Christians were doing 500 years ago, it's not that different than what the Muslim terrorists are doing today.
Christians had to go through schisms, reformations, and centuries of soul searching to get where they are today. That hasn't happened with Islam. They have barely scratched the surface. We can't expect centuries of reform to happen overnight. We can hopefully just keep moving forward, and leading by example.