Hi myelaine
I meant the first meaning of the word property [“a thing or things belonging to someone”]. It is the same word my mom’s attorney used in the Court during the hearing of her divorce case saying my dad was treating her as his property, as an object to give him a sensual treat whenever he wanted, not as an individual to be cherished. Judge understood what her attorney meant when he used the word “property.” And she got divorce from my dad, and she has never bothered even to think about him which shows how much she hates someone who used her as his property.
I have also heard some girls using the same word in our college campus to keep away certain selfish boys from them.
Back to your question: “Since love God and love your neighbour as yourself is a distillation of the law, how can obeying that law be a sin against humanity?”
In exalting one nation over others (Deuteronomy 28:1, 10, 13) and even authorizing them to own Gentile people as their slaves "for ever" (Leviticus 25:44-46.), and also in Woman being spoken as the property of men in (1 Corinthians 14:34-35), there is no love of the neighbor—it betrays total disregard for them (which is opposite of love). And also it undermines the primary truth that we are all humans first, children of God. Ultimately, whether we gave a humane treatment to other human beings or not—this is what counts. (Mathew 25:32-46)