“Who is it to say they are wrong. ‘Ye without sin’”
Do you even know what you are quoting? Christ did NOT say the adulterous woman they brought to Him did not sin. In fact, He told her to go and sin no more.
He taught not to condemn. That does not mean not to recognize and reprove sin.
So, who is to say? God. That’s who.
Leviticus 18:17, 24-30
You shall not uncover the nakedness of a woman and her daughter, nor shall you take her son’s daughter or her daughter’s daughter, to uncover her nakedness. They are near of kin to her. It is wickedness.
Do not defile yourselves with any of these things; for by all these the nations are defiled, which I am casting out before you. For the land is defiled; therefore I visit the punishment of its iniquity upon it, and the land vomits out its inhabitants. You shall therefore keep My statutes and My judgments, and shall not commit any of these abominations, either any of your own nation or any stranger who dwells among you (for all these abominations the men of the land have done, who were before you, and thus the land is defiled), lest the land vomit you out also when you defile it, as it vomited out the nations that were before you. For whoever commits any of these abominations, the persons who commit them shall be cut off from among their people. Therefore you shall keep My ordinance, so that you do not commit any of these abominable customs which were committed before you, and that you do not defile yourselves by them: I am the Lord your God.
When a man has sexual relations with any woman and also her daughter or granddaughter, it is incest, whether it is biologically his daughter or not. The passage above makes it clear that this moral boundary applies to ALL nations. It is not merely a ceremonial regulation for Israel.
I should have added a sarc tab.