Um, they already do. AMPAC and local mosques are taking cues from their European counterparts to demand Sharia Law, parallel legal courts, entitlements, and litigation-based action if their demands aren't met.  It has stifled Belgium and France's resources and options to respond to the ongoing wave of attacks they face from Islamic extremists every week, which has totaled over 260 people dead in France in the last year and a half.
.
......but that's the same as a little group of nuns who don't want to pay for your birth control, right?  SMH.