The God of this universe is the One who created and defined marriage as a union between one man and one woman, and no one has the authority to change that definition. Those that do will stand before Him one day to be judged for all eternity.
Furthermore, God’s Word makes it crystal clear that homosexuality is an abomination in God’s sight and its practice is sufficient to preclude one from the kingdom of God.
And the first chapter of the book of Romans states that a society’s acceptance of homosexuality is a sign that it is under God’s judgment and is ripe for destruction.