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We have 2000 BC.
A world ruled by the carnal instincts of man. The norm in most societies was to act purely for the wellbeing of yourself and maybe your family. This includes, iE., that if you get a new child you cant care for, or because things arent going well due to a bad harvest or whatever, you decide to sacrifice your child to Moloch, Cronus, Baal, Quetzalcoatl or any other deity of choice.
This was completely acceptable since there are many gods, and no matter what your desires are you can just pick the deity of choice who is worshipped through the acts you like to do. Now naturally there were deities worshipped through good acts, and tribes staying away from the evil, but since giving in to you inner desires is easier than self restraint, and since those small groups didnt resort to cheating, murdering, lying and deception they usually didnt become big. This is OK since there is no ultimate authorities. The many gods are all as legit as the other and its only personal preference which deities you choose to worship, which you deem gets you the best benefits or fits your way of living best rather than adjusting your behavior.
Following the local rules was done not because you agree with it, but to avoid punishment of the active ruler and thus just served your personal well being.
Now enter God. The supreme creator and absolute authority enters the scene. Into this moraly relativistic world full of hedonism he chooses Abraham to sow his seed. With this act objective morality (which can only derive from an absolute authority that is independent of the world in a manner the Bible describes) entered the world. From this revelation and the guidance of his Christianity took over first Europe, and then through Europe the entire world. It spread this concept of objective morality across the entire globe and transformed, even though not all converted, many did decide to do the objective good for others and created a world in which charity and selflesnes is glorified.