How could sharia law ever come up, or be applied in any official setting when it hasn't been passed by the legislature, signed by the governor and codified?
The same way foreign law has come up and been referenced in supreme Court decisions.
Though the constitution is clear, there’s nothing wrong with hitting that nail one more time. They apparently need a dent in the wood on this one.
Our system of law combines the written statutory law and the unwritten common law. Common law is essentially court-based rules to adjudicate in areas where statutory law has not been established. Until overruled by a higher court, superseded by statutory law, or overturned by the existing court on re-visiting the issue, the original precedent stands as law in the court's jurisdiction.
Sharia law could creep into our system of law through common law. It could also creep into our legal system through contract law. I'd like to see legislation which as a matter of public policy forbids courts from enforcing contract provisions which are uniquely-derived from Sharia law.