The teachings of Christianity are very hard to compare to the values of the earlier civilizations such as the Greek.
To start off, Christian teachings are loving and help you to be a more Christ-like person. While Greek teachings are very crude, showing how to be a self centered war hero. Some of the great ancient thinkers did not believe that the Greek way of teaching was completely correct. They thought that the gods should be loving and caring such as Christ.
Once Christ came into this world they found that there was such a thing a loving God.