Sorry, but this is much ado about not very much.
In the Texas case, some Muslims lawyers have established a tribunal where devout Muslims can take their disputes to be settled. The rulings have no standing legally, and either litigant can just ignore them is he so chooses.
IOW, it’s similar to canon law in Catholicism, religious courts in many churches, and rabbinic courts in Judaism.
http://www.theguardian.com/world/2012/mar/29/brooklyn-da-orthodox-jews-cover-up
For that matter, any two people in a dispute anywhere can agree to have a third person rule on the dispute using whatever rules or “laws” they mutually agree on.
Doesn’t make it “law” in any real sense.
OH?
LET THEM take the _____ back to wherever they and it came from