The same reason it's important to Christians: it offers hope of reward for a life well lived, despite the hardships of that life.
Hera
Hera
The Elysium Fields
Heaven: the sky-dome.
Hades is not only Hell. It's the realm of the dead, and there are a few different areas, including the Fields of Punishment and Tartarus, which were Hell, and Elyssium and the Isles of the Blest, which were something like Heaven.
Its sibling is Heaven and his father is Chaos
In mythology, Greece is referred to as the land of Gods.
Jupiter was ruler of Heaven and Earth.
Uranos, like in Greece, was the personification of Heaven, it is usually said. But he is rather the Sky, I think.
It can pertain te fact that Olympus is heaven and Zues is heaven's over seer. And can also describe Aphrodite
Because, if they were females, they'd be GODDESSES!
According to Hindu mythology the river ganges originates from Heaven. So it's sacred.