The ability to arbitrate legal contract disputes is a fundamental tenet of contract law in the U.S.
Two parties to a legal contract decided before signing the contract that any disputes about the contract would be arbitrated by a panel of Muslims of their choosing.
Amish, Jewish, and various other religious groups also want their own advisors to mediate contract disputes between two parties in their group. They have the right to establish how they want to resolve contract disputes.
If you say there can be no Muslim arbitration panel established by Muslims, then you must also say that no other religious group can establish an arbitration panel for its members. In so doing you are fundamentally changing contract law in the U.S. by revoking the rights of parties to a contract to arbitrate disputes and forcing them into a court of law.
No faith-based arbitration, is what I’m saying. That’s all.