So which sense do we use to interpret the rules set out on how to get/treat slaves? How is that interpreted? Is it a metaphor? And how do you know which is which?

What it sounds like is you have lots of leeway to account for what you choose to believe is truth or fiction to fit your needs at any given moment. And if you’re not sure what, if any, is literally true, how do you know there’s a god at all? And you’re defending Catholicism, which is in for an even more uphill battle than most because it’s been around longer and has to account for all the beliefs that have had to be updated as knowledge and culture had changed.