I work in high-tech with plenty of Muslims who are obviously not terrorists and never will be. And show me where I indicated I believe all Muslims are to blame for terrorism? You're simply exaggerating to make a point.
ISIL certainly are Islamic terrorists using Islam to further their objectives and  if you are arguing otherwise, you do not understand the current conflict in Syria. 
Islam does have a radical fundamentalist problem and that makes it a religion like no other. 
Your original post misread Clear Thinker's point, which was the terrorist might have been born in Britain, but he had abandoned the values of the British people and therefore cannot be considered British any longer. That seems like a reasonable conclusion.
Sympathizing with the radical Islamic terrorists won't cure terrorism either, so please stop.