The law banning Sharia Law.
If SCOTUS forbade Oklahoma from banning Sharia Law, then Oklahoma must nullify that decision as utterly unconstitutional.
Art. IV Sec. 4 burdens the feds with guaranteeing that every state have a republican form of government and protecting each state against invasion and against domestic violence. The Supremacy Clause and the Ninth and Tenth Amendments put the Constitution and federal constitutional laws as the Law of the Land and those powers and rights not mentioned on the Constitution belong to the people and the states.
No American citizen should be subject to Sharia Law or any other unconstitutional and non-republican form of law or government. A SCOTUS decision prohibiting a state from banning Sharia Law is DIRECTLY OPPOSED to the wording and guarantees of the above-mentioned articles and Amendments of the Constitution. Oklahoma and any and every other state has the constitutional right to ban Sharia Law and to nullify any federal law to the contrary as unconstitutional.