A violent, totalitarian ideology

Michael Hiteshew writes at Chicago Boyz,

Should the USA stop immigration of muslims into the country? I think yes. I would go further, and declare – through legislation – islam a seditious ideology and outlaw its practice. I would even close mosques.

Let me be clear. This is not my being opposed to a strange religious practice, or a group of people because of their ethnicity, this is about recognizing islam as a violent, totalitarian ideology. In the same way we would not invite members of a violent cult to live in our homes with our family and children, we should not invite islam to live in our larger civilization. And recognizing its violent and totalitarian nature, we should outlaw its practice.

I do not see this as a violation of religious freedom. If I declare an intent to kill everyone who does not join my cult, and propagate that idea through my offices, then declare my beliefs a religion, am I then free to go about carrying out my agenda and proselytizing others to kill and subdue as well? And is a society that wants to protect its citizens, its freedoms, and its way of life within its rights – within its responsibilities – to prohibit that cult from practicing?
If not, why not?

And if that violent cult wishes to bring more of its members from overseas to join them, are we morally obligated to admit them?
If so, why?