Srdja Trifkovic makes a case for viewing Islam, or at least some forms of Islam advocating violent jihad, as a political ideology, not strictly a religious practice deserving conbstitutional protection and deference:
We don't need any legislation to protect CAIR's clients' privacy, we need the law that will treat any naturalized citizen's or resident alien's known or suspected adherence to an Islamic world outlook as excludable—on political, rather than "religious" grounds...All Americans—real Americans, that is, and not those who falsely take the oath but preach jihad and Sharia—will be spared the worry about Mr. Bush listening in to their phone conversations if Islamic activism is treated as grounds for the loss of acquired U.S. citizenship and deportation. The citizenship of any naturalized American who preaches jihad, inequality of "infidels" and women, the establishment of the Shari'a law, etc., should be revoked and that person promptly deported to the country of origin.
There are endless complications, of course. But the question of some forms of Islam as a political ideology as well as a religion is worthy of thought and debate.