With regard to USincognito's hypothetical/gotcha comment about Shari'a law: Muslims already
are allowed to have their marriages recognized according to Shari'a law in places in the USA that have Shari'a courts,
such as Texas. (NB: in the video at the link, when the Imam mentions providing notary public services, that is to do things like solemnize Islamic marriages, as Islamic marriage does involve the literal signing and notarization of contracts between the husband and wife.) As the video explains, the outrage over "Shari'a taking over America" via things like the Shari'a court/mediation center in Texas is misplaced and misinformed for many reasons (though I obviously disagree with what amounts to a smoothing over of the rough edges of Shari'a by the video presenter, or the association of anti-Shari'a with raving right-winger or whatever; everyone of my Church is against Shari'a because they've had to actually live under it in their Islamic-majority countries of origin, but I've never seen Pat Buchanan at liturgy), but in terms of having Islamic marriages as recognized by Shari'a law in America, yeah, that's already a thing, so it doesn't work as a hypothetical.