does not invalidate their faith as you try to suggest.

      I am not invalidating their faith only the faith of the underwear bomber. His faith is in the idiot's rant that sent him on his merry way.

I am not invalidating their faith only the faith of the underwear bomber. His faith is in the idiot's rant that sent him on his merry way.

No you are applying the No True Scotsman argument and I know from the years of reading your posts that you are so much better than this. The underwear bomber truly believed in Islam and what he was taught and that it was truly his faith. And there is an interpretation of his faith that justifies his actions. He is no less a Muslim, than YEC Christians no matter how misguided you or I might think they are.

Is that really any different from the 'faith' that gave us the Dark Ages and The Spanish Inquisition? 

      Neither dark ages or the Spanish inquisition was an issue of faith. The dark ages was the displacement of
Roman law by barbarian from the north and the Spanish Inquisition was business and fear of the outsiders, Muslims, success. As for the rest, European kings needed money and some groups had it and they wanted it.

 he was taught and that it was truly his faith.

      He was taught by the faithless. I would say that the underwear bomber was a slow minded jerk.