My chose is the Catholic Church, because the Catholic definition has too components: 1) the religious :Marriage is matrimony, and sacrament in which the small church of husband and wife are ministers of grace; 2) the non-religious” Marriage is a natural institution fconsisting of of a man and woman and their anticipated offspring. This definition arise as the experience of two thousand years or more of western history. If anyone wants to learn about the historical development of the family in western society from the Middles ages until recently, the form of family which modernists have sought since the 18th Century to disestablish,read “Marriage and the Family” in the Middle Ages” by Frances and Joseph Gies,Harper and Row, 1987.
OK, so your libertarian war against America and conservatism is to impose a Catholic theocracy over the United States.