Christ however came to set us Free from rules and legalism. It was His mission to liberate those in bondage to anything .. crutches, law, sickness, sin and ultimately from death.
And yet it was Jesus who said "Render unto Caesar what is Caesars. And render unto the Lord what is the Lords." I understand that from the Christian perspective everything ultimately belongs to the lord. But the fact that the New Testament condones slavery and in fact states that slaves should remain obedient to their masters no matter how cruel they are seems to contradict your claim that Jesus came to set us free from rules and legalism.
Sure they're sweet little meaningless nothings like Paul saying "There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus." Galatians 3:28
But in nearly the same breath Paul says "Tell slaves to be submissive to their masters and to give satisfaction in every respect; they are not to talk back, not to pilfer, but to show complete and perfect fidelity, so that in everything they may be an ornament to the doctrine of God our Savior." Titus 2:9-10
And in the Old Testament slavery is even more prevalent. "When a slave owner strikes a male or female slave with a rod and the slave dies immediately, the owner shall be punished. But if the slave survives a day or two, there is no punishment; for the slave is the owner's property." Exodus 21: 20-21
Why should we believe in a view of God that has no problem with slavery and in fact condones it and even tries to regulate it? And lately I have been hearing the argument from Christians more and more that slavery was somehow different back in olden times. That it was somehow less cruel and less inhumane.
To those arguments I simply say BULLSHIT! Slavery is owning another human being. That is it! It is wrong and always will be wrong. Just because slavery didn't use to be racially motivated does not mean it has any merits to it. And I don't see how the acquisition of slaves through conquest is somehow humane and understanding!
No wonder Nietzsche thought that Christianity is the religion of the slave.