If this were to happen, one of the first items I'd want emblazoned onto the Constitution is making the practice of, support of, or the action of actively working toward Communism, Marxism, or any socialistic practice that can possibly deny the rights of individuals, entirely illegal - punishable by death.
Make Islam explicitly unprotected. Perhaps with wording like Moslems will have no more protections or privages than infidels in Mecca have.