Entering into such a marriage, God is the third partner who guards his investment.
But when people enter into a marriage who are not a man and a woman, God cannot bless the union, in fact the union is cursed.
God will not be mocked.
Marriage was designed by God for His people. There is no marriage even between a man and a woman, without God. The state "license" has no bearing on the Godly design of marriage. "Gay" marriage is evil, designed by their god, satan.