perhaps the first laws in the history of all humankind.

Not even close. Not even the first in the middle east.

Christianity and the New Testament is free from the law (the Old Testament law).

You know what else he said in the sermon on the mount?

^{“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. For truly I tell you, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven."}

What was that you said about being free from the law?

THAT, is a spiritual truth. THAT can allow fair treatment of all humans. ALL: Gay, female, straight, male, everybody.

If we can accomplish fair treatment without importing the idea of "spiritual truth" (what does that even mean?) it would be much simpler. But as far as I can see, the ones fighting against that fair treatment idea are the ones who like to pretend that they are the holders of "spiritual truth."