Morality is absolute; however, it changed with the advent of Christ.
=== What is absolute does not/cannot change. If it does change then it never was, never can be absolute.
So you could say morality is relative... It changed once in history.
=== If it is relative, then I can have my own morality. So who are you and your co-fools in your idiotic mythology to speak to me about morality? I have my own, thanks.
Prior to Christ, the world operated on a different basis.
=== Really? Citation. And hard concrete evidence that Christ was god. It was men at the Council of Nicaea (AD 325)who decided that at the command of the pagan Emperor Constantine - btw he converted only on his deathbed, killed his wife, Fausta, and his son, Crispus. Some Christian. All the hallmarks!
After Christ, of course, morality is still absolute.
=== See my refutation of this nonsense above.
The world was not ready for Christian morality until the 1st century AD.
=== Again. If morality is absolute, there cannot be Christian morality, Muslim morality - only MORALITY.
Both the creations of the Greek and Roman Empires made it possible
=== Except briefly under Alexander of Macedon, there was no Greek Empire. On Alexander's death in Babylon, his empire broke up and it was divided among the strong men in his army.
as we can look at Rome and see that there were even Jews like Paul who were Roman citizens;
=== Citizenship was for sale, or could easily be obtained by those who performed some service for Rome.
the concept of the state embracing more than one sort of ethnic group was revolutionary
=== Except that it was around for quite some time. The ancient world did not have modern prejudices about ethnicity and the colour of one's skin.
and helped create a situation where we would be more likely to live in more stable and sustainable peace with one another.
=== Then explain the Inquisition, The Cathar Wars, the Crusades, Modern terroris and events like the First and sEcond World Wars, The Korean War, the Gulf Wars etc, etc, etc. (Far too numerous to mention them all)
=== You are fool and naive. You display a remarkable lack of understanting of the meaning of words and I honestly think you have no clear idea of how idiotic your ideas are.