If there is a hell, I expect there will be a special circle reserved for terrorists.
Oddly, I argue that suicide bomber must go to their Islamic heaven. Why? Because they gave their life for Allah and were told that they will be rewarded for it, and Allah can't welch on the deal. Yes they are bless'ed morons that misinterpreted the writings, but is that a get out clause for Allah as, after all, they died in his name?
This is the whole problem with religion fuelled terrorism. One can argue that it is diminished responsibility as you really have to have a screw loose. When it was the IRA or the Basque separatists, they did those murderous things in the name of territory and political argument. For that, they have to take complete responsibility.