Marriage was instituted by God, not invented by man (cf. Catechism of the Catholic Church, n.1603). The Creator has built it into human nature, even into the human body, in its two complementary forms, male and female. ‘Male and female He created them’ (Gen.1: 27): man for woman, and woman for man, united in marriage as ‘one flesh’ for the procreation of new life: ‘Be fruitful and multiply’ (Gen. 1: 28).
God has given marriage its essential characteristics and proper laws: unity (one man married to one woman); indissolubility (nothing but death can end a marriage); and openness to procreation (in every act of physical love). No president or religious leader, no senate or synod, nor any government, has the authority to re-define marriage.
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