When did the Greeks believe in Christianity?

People worship gods for many reasons, perhaps originally because this gave them some control over their lives. They could call on their gods to ensure a good crop, a victory in war, help in a crisis or any other worthwhile purpose. In other Words, the people who believed in the Greek gods and goddesses did so for much the same reason as their contemporaries who believed in the Abrahamic God. The Romans adopted the Greek gods and continued to worship them, as did the Greeks, until the adoption of Christianity as the Roman state religion. Zeus, the chief God of the Greek pantheon is believed to have originated in the proto-Indo-European culture more than 4,000 years ago. Worship of the gods survived in the Roman Empire for some time after paganism was banned at the end of the fourth century CE.