I think we can all agree that, for thousands of years, both good and evil have been done "in the name of religion."  Too often, IMO, zealots use religious doctrine and twist it to justify their actions.  Certainly this is true of "radical Islamic terrorists."  It's also been true of "radical Christian zealots" who have bombed abortion clinics and killed abortion doctors.  We can trace the history of the wars which were very frequently based on, among other factors,  religion.  

Of course not all Christians are "right-wing wackos", just as not all Muslims are "radical Islamic terrorists."  We need to remember that many of the targets of the anti-abortion radicals were (and are) Christians themselves....and we need to recognize that the chief targets and victims of radical Islamic terrorists are, themselves, Muslims.  

Radical Islamic terrorism involves, as well, nationalism, tribalism, and other economic and social issues ...

complex questions seldom have simplistic answers...