Oh, so this writer states that Mohammed never did anything like inciting his followers to violence.  Well that is nice, but completely untrue.  I have a quran in front of me, and there are well in excess of 100 such passages (sutras).  Here is one, and not the bloodiest by any means..."Fight in the cause of Allah those who fight you...Slay them whenever you fall upon them...apostasy by force is indeed more serious than slaying...Fight them until there is no longer apostasy, and the religions is Allah's."  (Sutra 2:189).
The issue with Muslims in the West is not whether or not they are terrorist threats,  the issue is precisely at the source of their religion...the Quran.  It is apparent the religion is in need of scripture criticism as there was an initial period of biblical criticism out of Germany in the early 19th Century.  But it isn't going to happen in the Muslim stream, and as a result this evil cult will ultimately collapse.  We can see it happening all around us.