GREEK RELGION MYTHOLOGY BECOMES FULLY ESTABLISHED Classic paganism bloomed fully in Greece between 1000Bc to 900Bc and hence became the state religion of Greece until the advent of Christianity. The ancient Greeks believed that 'chaos' spawned Uranus and Gaea - heaven and Earth - from whom descended the Titans, giants who were later defeated by Zeus, Hera, Poseidon, Demeter, Apollo, Artemis,Ares, Aphrodite, Athena,Hermes, Hephaestus and others....