Must the constitution yield to Sharia?

Scroll through X long enough, and you’ll see it: Muslim preachers denouncing America as corrupt, portraying liberal democracy as a fraud, and — most alarming — arguing that Sharia law should replace the U.S. Constitution. Some clips are foreign. Some are domestic. Some are deceptively edited. But enough are real, and enough are applauded, that dismissing the phenomenon as “rage bait” is no longer responsible.

Let’s begin with a principle that should unite Americans across party and faith: Religious freedom is not the same thing as permission to dismantle the constitutional order. The First Ame...