Islam is a religion of violence, murder, and death.
Regardless of any 'freedom of religion' argument, the American Constitution does not allow human sacrifice as a religious precept.
Also, the Constitution does not allow 'honor killings', or slavery, or terrorism, beating your wife, or murdering homosexuals.
Islam is a Death Cult, not a religion in the way the Constitution defines it. Religion should 'benefit' the community, not terrorize it.