Then you are contradicting yourself. And now you posture to bully your way to a "win".
You claim right and wrong are fixed and not opinion, yet you agree that today we in the U.S. and many countries consider having more than one wife wrong enough to justify criminal charges. You agree that stoning a woman found in adultery was considered right at one time but wrong today in our culture. Some (Catholic Church) considered divorce to be wrong enough to justify excommunication, yet most in our society find divorce to be right in some circumstances and neither right nor wrong in others.
Questions of right and wrong are determined by morals and ethics. Philosophers dealing with the question say morals and ethics are not the same even if the dictionary says otherwise. Ethics, they say, deals with innately known questions of right and wrong, like murder, and morals are culturally determined as to right and wrong. I think this may be where we are having trouble. We would agree that murder is wrong and stealing is wrong, etc. But we disagree on some morals of right and wrong because they are culturally determined and your culture is likely different from mine on a number of issues. Hence we disagree on some issues.
And yet there is no absolute regarding ethical or moral right and wrong. If there were, then ethics would be universal. Yet in a wolf pack wolves occasionally kill each other and it is considered by biologists and others to be proper as a survival matter and for purifying the species and keeping it strong. So even ethics are not absolutes even though they are innate to us. They are not innate to wolves or other species.
But humans largely agree on ethical questions yet disagree on moral questions because while ethical questions like murder are determined by innate (or genetic) forces, moral questions are determined by culture which makes them opinion-based and not fixed.
So it is incorrect to declare that right and wrong are fixed and unchanging.