If we think the Bible’s prohibition of homosexuality in Leviticus is obsolete because it’s old and analogous to other Old Testament laws that pass away, we should also think that the laws against adultery, bestiality and offering children to Moloch have passed away. These are the reasonable laws to compare for continuity.
When people argue that the proper laws for analogy have to do with eating shell-fish or tattoos they might be showing a light respect for sacred scripture or a lack of talent for legal reasoning.
These laws grouped together as an expression of moral reasoning (not for Israel as a typical people) but as general laws for all people, Jew and Gentile, exhibit themselves as manifestation of the Moral and not merely ceremonial law, as expressions of universal goodness and applicable to all persons under the same or similar circumstances.
Since they are binding and perpetual expressions of the laws of God, if we void them we mark ourselves as divorced from His covenant and so from His grace.
It’s not very different from rejecting His law against worshipping other gods or premeditated murder.
To reject the law of the God is to reject the God of the law. All through scripture, Old Testament or New, He takes these things personally.
The law on this explains that this is how the Gentiles (not the Jew or the Christian) pollute themselves and so any argument that calls them rules for Israel misses the point. Of course they were rules for Israel; were reading a law book of Israel but the law itself was for everyone and pre-existed the writing of the text (any law that pre-existed the text cannot be reasonably argued to be limited to the text). The text doesn’t create the law it simply codifies it into written form.
So often, we hear people comparing the ancient equivalent of traffic code against International Law and thinking their arguments obvious and air tight.
Christians though should be clear minded and more careful.
Just read it for yourself and use your best judgement as to what’s being said.
20 “‘Do not have sexual relations with your neighbor’s wife and defile yourself with her.
21 “‘Do not give any of your children to be sacrificed to Molek, for you must not profane the name of your God. I am the Lord.
22 “‘Do not have sexual relations with a man as one does with a woman; that is detestable.
23 “‘Do not have sexual relations with an animal and defile yourself with it. A woman must not present herself to an animal to have sexual relations with it; that is a perversion.
24 “‘Do not defile yourselves in any of these ways, because this is how the nations that I am going to drive out before you became defiled. 25 Even the land was defiled; so I punished it for its sin, and the land vomited out its inhabitants. 26 But you must keep my decrees and my laws. The native-born and the foreigners residing among you must not do any of these detestable things, 27 for all these things were done by the people who lived in the land before you, and the land became defiled. 28 And if you defile the land, it will vomit you out as it vomited out the nations that were before you.
29 “‘Everyone who does any of these detestable things—such persons must be cut off from their people. 30 Keep my requirements and do not follow any of the detestable customs that were practiced before you came and do not defile yourselves with them. I am the Lord your God.’”
Now obviously, there are both ceremonial and moral laws within the Bible in general and the book of Leviticus in specific, and there might be places where it’s a labor of the mind to distinguish which one we’re dealing with at the time, but this doesn’t seem to be one of them. Really, this is one of the most obvious expressions of the contrary, where the moral and non-figurative nature of the text is laid out with an excruciating clarity, such that it leaves us without an excuse.