It took twelve centuries for the Catholic church to make it a sacrament. For much of its history, the church was happy to let the state own the issue:
Those who do not want to let gay partners have the sacredness of sacramental marriage are relying on a Scholastic fiction of the thirteenth century to play with people’s lives, as the church has done ever since the time of Aquinas. The myth of the sacrament should not let people deprive gays of the right to natural marriage, whether blessed by Yahweh or not. They surely do not need—since no one does—the blessing of Saint Thomas.