I disagree pretty vehemently with your example. Creationism is demanding that it be included as part of the content of science. That might seem harmless enough and perhaps even a good, tolerant and inclusive thing to do. The problem is that creationism isn't science. It's thinly-veiled religious doctrine and its presence in science and science teaching would distort and subvert the nature of science. (Which of course is the goal.) Imagine the mirror image situation: Suppose that scientists were agitating for laws that required that science and its attendent empirical naturalism be included in religious doctrine. Make sure that congregations leave church with the idea pounded in that doubt about the superatural is as much a part of the Christian tradition as Jesus. Can you imagine the screaming from the churches at that kind of suggestion? Just as religious doctrine isn't science, science isn't religious doctrine. The requirement that science and the scientific attitude be taught in churches as an integral part of the religious tradition would be subversive of religious tradition, turning it into something that it's not and has never been. (Luckily, the Constitution forbids such a law here in the United States.) Minimally speaking, atheism is just a lack of belief in theism. It doesn't really have an organization, method or doctrine. That means that it's difficult to speak about atheism in the same way that we speak about something like Roman Catholicism that has its own hierarchy, history, beliefs and elaborate traditions. What we are faced with are individual atheists. Some atheists are seemingly always angry, hostile and abusive, but most aren't. Unfortunately, the aggressive ones are more apt to make themselves known to people that they disagree with. The same phenomenon is visible in how Christianity impacts outsiders. Most Christians are relaxed and open-minded about their faith, but the ones that wave Bibles crazily in non-Christians' faces represent the most uncompromising, hard-core, militant believers. So the targets/victims sometimes come away with the idea that Christianity consists of nothing but rabid fundies. I suspect that Islam suffers from similar perceptual distortions, made worse by the fact that the anti-modern medievalist militancy seems more widespread, more pronounced and more violent in Islam than in other communities.