I think many people of all faiths would argue that radical islamism is morally wrong even though they believe that they are acting morally right based on their beliefs.
There are radicals in all religions, Timothy McVeigh , the KKK, the Branch Davidians, James Dobson, Jerry Falwell, Skinheads, Pat Robertson Neo Nazis, and on and on all claim to be Christian. Some are violent in actions, some want to control your behavior thru legislation. We should all remember, just because it says so in your religious text, doesn't mean it's true.