Newsflash – the state only recognizes the marriage AFTER it takes place in the church!
Maybe your friends need to get a little instruction in how these legal documents work. Getting a marriage license only means that the state recognizes you have no legal impediment to marriage. The Church handles the search for spiritual impediments, BTW.
The couple has the marriage license in hand the day of the wedding. They exchange their vows; they and the witnesses and priest/deacon sign the license. And then the signed license is filed with local authorities.
But the state does not recognize the marriage until the license is filed with them. They recognize the possibility that someone might get a license and then reconsider and not go through with getting married.
It’s the same with purchasing or transferring of property – until the deed of conveyance is filed with the county, the land/home remains the property (and responsibility) of the original owner.