[expat_panama]

states cannot define marriage insofar as said definition becomes an attack on the free exercise of religion.

Yet there've been many cases where Muslims and Christians were arrested for participating in illegal plural marriages:

Charges laid against Bountiful leader Winston Blackmore ...

After the Manifesto: Modern Polygamy and Fundamentalist Mormons

Twentieth-Century Polygamy and Fundamentalist Mormons in Southern Utah

the rampant practicing of polygamy among Muslims here. It’s time we enforce our own laws and end this barbaric practice.

 visiting Muslims, the United States refuses to accommodate polygamy in any form, even ... Upon his arrest,

[Olog-hai]

Those cases were not free exercise. Nice try though. Going to cite human sacrifice next?