When was Greek mythology created?

The Greeks created Greek Mythology. They created the myths from fear. They were afraid of weather so the Greeks created Zeus, god of the sky.
The Greeks made up Greek mythology to explain stuff. The myths came about by fear. The Greeks were afraid of the weather so they made Zeus. They wanted to believe that there was a life after death so they came up with Hades and the Underworld. They were scared of earthquakes and the ocean so out popped Poseidon. The list goes on...