Indeed ethical systems have changed throughout the lifespan of a religion. Religions are not set in stone and change more than what most religious people are willing to admit.
For me, it always felt like the interpretation of the Holy Books are changing through time as we understand science more and more. And it feels ironic to me.
Surely all christians today believe that tricking somebody with dubious pretexts into debt-based slavery (as often happens with human trafficking of sex workers, where women have to formally pay up their debts and incurring the costs that they captors incur in hosting them in sub-human conditions).
Um, no, it isn't. It's how Genesis was interpreted by most people of the Jewish and Christian religions throughout most of the time since it was written. What is a fairly recent phenomenon is people of those religions not interpreting Genesis (and the Bible in general) literally.