The irony of R2K (Radical Two Kingdom) proponents accepting legalization of homosexual acts and unions on the basis that natural law is the only source of authority in the public square is exquisite. Why? Because the Bible, if it teaches natural law anywhere, teaches it in regard to homosexuality:
Romans 1:26-27 For this reason God gave them over to degrading passions; for their women exchanged the natural function for that which is unnatural, and in the same way also the men abandoned the natural function of the woman and burned in their desire toward one another, men with men committing indecent acts and receiving in their own persons the due penalty of their error.
But, of course, advocates of R2K cowardice can't call Christians to speak against homosexual unions in the public square as unnatural because it's the Bible that says so and they've severed Scriptural authority from the public square.
What a wonderfully circular system of logic that declares only things revealed by nature to be legitimately proclaimed by Christians in the public square, but when Scripture says nature reveals a thing, argues that the thing can't be proclaimed to the world by the Church because the declaration that nature teaches it is found in Scripture.
Imagine the mess Jonah would have found himself in if he had lived by R2K strictures in Nineveh's public square....