Conservative Christians do indeed suck, but I can't think of any serious terrorist or even violent activity by Christians in a very long time, except for a couple cases of some lone wacko shooting an abortion doctor.
The difference is the power structure.
You don't have to personally beat someone for your beliefs if you can have the police do it for you because your beliefs are the law.
Muslims, however, are infamous for organizing to do violent deeds.
The same can be said (and has) about the black "rioters" and the current protests here.
Advocating for various laws (which aren't very successful BTW, gay marriage is becoming more and more accepted in America now and is becoming legal all over; these days I think most ultraconservatives are more worried about illegal immigration, gun control, and various other issues than about gay marriage) is not similar to carrying out violent, terroristic acts.
The difference is whether the majority view them as "legitimate" exercises of violence.
Passing a law that will be used more against X than Y will not be seen as a problem by Y. And the Y's will tend to view any X that complains as being a problem.
100 years ago blacks could not marry whites. And violence against a black man accused of sex with a white woman was "justified".
20 years ago gay marriage was illegal. And it wasn't a "hate crime" to beat someone just because you thought he was gay. I remember online arguments just 10 years ago.
Right now there are states where it is legal to have an abortion BUT it is almost impossible due to the legal restrictions placed upon it. Even if the woman's life is in danger.
Those with the power to make and enforce the laws do not need to personally take hostages.