Every society on Earth practices marriage. Those 5 billion non-Christians out there practice marriage, it is a cultural universal, and marriage takes on many different forms across the entire human specie.
doekiller is correct on this one.
"Never Trust Government" -- Smart people. "The Great thing we should Fear and the Weird Thing we Trust is Elon Musk" -- Me "You can be broke but you cant be poor." -- Ruthie-May Webster