The first amendment protects the rights of even a pagan who believes in human sacrifice. It does not protect the right to practice that sort of sacrifice; merely to believe in it.
I believe the first amendment protects the right of muslims to belive in their nonsensical death cult promulgated by the drunken, child-raping murderous psychopath mohammad and his stupid stone moon-god allah. The first amendment does not protect the practice of the requirements of the heinous koran go kill, maim and persecute the sane portion of humanity that rejects the sewer-slime that is islam.
I hope I made myself clear.
Not only that, I think you've got it in one.