If a person is homosexual by nature - that is if one's sexuality is as intrinsic a part of one's identity as gender or skin color - then society can no more deny a gay person access to the secular rights and religious sacraments because of his homosexuality than it can reinstate Jim Crow.
When a nation goes down or a society perishes one condition may always be found they forgot where they came from. They lost sight of what had brought them along.