Well... Mohammedans should have the right to embrace their idiotic sect. There's no point in restricting their civil rights as they have the right to believe in the hallucinations of a murderous pedophile.
They have as much right as Nazis who want to practice their beliefs --- but they need to be watched very carefully --- and their book is as much hate speech as anything else could be and should be restricted as such --- it actually calls for the slaughter of all Christians and Jews. If a book called for the slaughter of other groups, it would be considered a hate book. And as far as immigration --- we definitely have the right to limit who and what comes into this country --- Muslims have plenty of Islamic countries to live in.