So in essence slavery in roman times was an employer/employee relationship
Jesus wept . . . what flagrant horse poop. You need to read Machiavelli's Discourses
some time. If someone (a city state or a tribe) resisted Roman hegemony, but then surrendered before being engaged in all out warfare, there was a chance that some, some mind you, of their people would not be enslaved. If they fought the Romans, and were defeated militarily, their land was forfeit to the Roman state, and anyone who could not pay a hefty bribe was enslaved. If the Romans were forced to the necessity of overrunning all of their cities, and fighting the defenders of the citadel in the last city, all of their property would be seized and all of their people would be enslaved. There was no such thing as rights for slaves. When the Romans really
got pissed off, it got even worse. The Carthaginians fought them to the last ditch, and it took the Romans three wars to overcome them. When they had taken Carthage, they turned their troops loose in the city for three days to do as they pleased. What few survivors there were were sold into slavery. They then sowed the ground with salt so that no one could settle there again (i.e., they couldn't grow crops there).
You religious types live in some kind of touchy-feely happy horseshit world of cute bunnies and happy laughing slaves. That's just disgusting.