Short answer: YES! Not only in the United States, but a also in my own country, Australia, and the whole of Europe, for that matter.
Interesting idea. Seems obvious in retrospect. The answer being "yes" we should criminalise radical Islam. It's not against religious freedom to do so. Because we have not only "freedom of religion" but also "freedom from religion". And the problem with radical islam is that it seeks to impose itself on all others. And that's not freedom from religion.
