Nonsense. The solution is to deny Islam 1st Amendment religious status. Two grounds immediately come to mind - first, it formally decrees harm to non-believers. Second, it formally demands the replacement of the Constitution with its own governmental system. Any organization containing such requirements can easily be denied 1st Amendment religious status on numerous legal grounds.
Mark my words, it WILL come to this.
ALL shia and sunni muslims believe that ALL governments must come under sharia law.
That makes them the enemies of all other cultures and absolute traitors to the US constitution.
We are under no obligation, legal or moral, to embrace or even tolerate any group that seeks to destroy our government or culture. In fact, this is why we have wars; to persuade such people to cease and desist.