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Origins

Mainstream Greek religion appears to have developed out of Proto-Indo-European religion and although very little is known about the earliest periods there are suggestive hints that some local elements go back even further than the Bronze Age or Helladic period to the farmers of Neolithic Greece. There was also clearly cultural evolution from the Late Helladic Mycenaean religion of the Mycenaean civilization. Both the literary settings of some important myths and many important sanctuaries relate to locations that were important Helladic centers that had become otherwise unimportant by Greek times.

The Mycenaeans perhaps treated Poseidon, to them a god of earthquakes as well as the sea, as their chief deity, and forms of his name along with several other Olympians are recognizable in records in Linear B, while Apollo and Aphrodite are absent. Only about half of the Mycenaean pantheon seems to survive the Greek Dark Ages. The archaeological evidence for continuity in religion is far clearer for Crete and Cyprus than the Greek mainland.

Greek religious concepts may also have absorbed the beliefs and practices of earlier, nearby cultures, such as Minoan religion, and other influences came from the Near East, especially via Cyprus and Phoenicia. Herodotus, writing in the 5th century BCE, traced many Greek religious practices to Egypt. Robert G. Boling argues that Greek and Ugaritic / Canaanite mythology share many parallel relationships and that historical trends in Canaanite religion can help date works such as Homer 's Iliad and Odyssey.

The Great Goddess hypothesis, that a Stone Age religion dominated by a female Great Goddess was displaced by a male-dominated Indo-European hierarchy, has been proposed for Greece as for Minoan Crete and other regions, but has not been in favor with specialists for some decades, though the question remains too poorly evidenced for a clear conclusion; at the least the evidence from Minoan art shows more goddesses than gods. The Twelve Olympians, with Zeus as sky father, certainly have a strong Indo-European flavor; by the time of the epic works of Homer all are well-established, except for Dionysus, but several of the Homeric Hymns, probably composed slightly later, are dedicated to him.