Christianity is based on the teachings of Jesus of Nazareth, a Jewish Rabbi from Israel. So how does Christianity different from the religions of Greece and other ancient cultures?
Greece had a polytheistic religion, as did Rome and most of the ancient world with a few exceptions. They worshipped Zeus, Artemis, Apollo, Hermes, and many others. There was no one deity in control, but there was a mix of authority. Zeus was the most powerful, but he could be thwarted at times. One example of this was when Prometheus stole fire from Zeus and gave it to men in Hesiod’s Works and Days. Christianity is like the ancient Hebrews in that it teaches that there is one God, Yahweh, and that he exists in three persons: The Father, The Son (Jesus), and The Holy Spirit.
Ancient Greece believed that revenge was important and that it was necessary to do so to appease the dead. Christianity does not teach revenge as something to be sought, but rather says that revenge belongs the Lord. Warfare was a large part of Greek society, and nations would go to war with other nations and take their possessions and bring back slaves. Christianity does not teach going to war unjustly or to plunder and oppress other people, but to love our enemies instead.
Some of the Greek thinkers did have some things in common with Christianity. Both Socrates and Plato believed that there is absolute truth, which lines up with the teachings of Christianity. Xenophanes, a philosopher, and Euripides, an ancient playwright, both were skeptical Greek religion and thought that the gods could not possibly be acting in the evil ways as portrayed in Homer’s epics. Christianity believed that God was perfect and that there was no sin in Him, making the views on the divine actions similar.