IF the Constitution has no say on the subject
IF the law has no say on the subject
IF stare decisis has no say on the subject
IF orbiter dicta has no say on the subject
THEN you can look to foreign sources non-binding inspiration as long as those sources do not disagree with any of the above.
We are a common-law country, which means the courts are allowed to make law.
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?????