HUH??? HUH???
There is no precedent relative to Sharia Law.
The Courts are NOT empowered to make law in America.
What on earth are you saying?????
Read up on common law. It is more limited in our system than would be in a pure common law system because the courts have to defer to statutory law, and exhaust it, before resorting to common law implementation. Fair Use in copyright is an example. Statutory law was not specific on the issue, and it remained common law for decades (relying on "progress of the arts and sciences") before it became part of statutory law.