I agree that humans have the right to sin but not to *demand* that others approve of their sins. I would also say that those who believe in sins and disapprove of sinfullness do not have the right to demand that sinners change - unless the sinner is deliberately harming others and breaking the law.
1. Depends on how you define demand. A call to repentance, which is the God given role of the church, would be a demand, in your view?
2. What about public nudity? Sex in public restrooms? For that matter, sex in public? Is anyone hurt by that? How? How about polygamy? Prostitution? Bestiality? Etc.
I would argue that the whole of society is harmed by homosexuality. And when you place homosexuality into a protected class status such as race, you are using the power of government to force immoral attitudes on everyone. It is oppressive to the mission of the church.
Rom 1:25 Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen.
Rom 1:26 For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
Rom 1:27 And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
Rom 1:28 And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
Rom 1:32 Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.