The real question is, were those people truly Christian doing God's will?
No, the real question is how far you are willing to twist yourself into a pretzel to deny that your oh so moral god specifially endorses slavery (and rape, genocide and...) and that people following this somehow weren't true christians.
The part you still don't understand is the reason you even know there is right and wrong is because God has revealed it to us
By kicking the two people out of the garden who learned about it? Nice and friendly god you have there. Also, how would they have known it was wrong to eat from the tree if by definition only the fruit would make them aware that what they did was wrong?
But nobody has that, after all the years of searching for it
Actually, evolution is pretty much the most repeatedly proven scientific (!) theory ever. And no, noone who cares about the truth gives a damn about theist clowns like you covering their ears going "Na na na na na, I can't hear you".
Most funny of course is that even if you clowns could muster the intelligence to disprove evolution, this would not do ONE BIT to prove your god exists. Tough shit.
The slaves of the bible were indentured servants working off a debt
Said the lying jackass who accused others of lying. Imagine that. And no, you can twist this all the way you want. Owning people as PROPERTY and being able to get away with beating them to death (as long as they don't die in two days) is not, was not and won't ever be intentured servitude.
But thanks for showing your true colors (not that we didn't expect this).