Question

Which Greek myth is the most important

Answer 1

This question is a opinion question, yet I would say the myth of all of the main gods. Cronus intended to swallow him as he had all of Zeus's siblings: Poseidon, Hades, Hestia, Demeter and Hera. But Rhea hid the newborn in a cave on Mount Dicte in Crete.

Answer 2

most likely the most important greek myth would be the greek gods themselves.