Gay marriage has not been prohibited. It was just never a thing. Marriage was something a man and a woman did. Two people of the same gender didn't have the requisite parts for such an endeavour. The only time gay marriage has been prohibited is in modern times. Whatever the law says, gays, unlike siblings or cousins of opposite genders, can never be married. Even if the law treats them the same, it doesn't change the fact that they will not have a marriage. They simply cannot, anymore than a tree can be married to a fountain pen, or a rainbow to a chicken. It's simply a biological absurdity. The ancients, whether Epicurean or pagan or Christian or whathaveyou, understood this. That's why even when homosexual behavior was permitted and condoned by society, no one clamored for their sexual relationships to be called marriage because they knew such a demand was as silly as demanding that a dog's tail be called a leg and insisting that dogs have five legs. It's clear to me that marriage law in the United States no longer intends to reflect the marriage of natural law, so I believe that religious institutions should be prohibited from conducting legal marriages (reserved only to the state), and that people should be able to make whatever power of attorney, inheritance, visitation rights, etc. legal contracts that they want.