Greek mythology being the richest source of the myths & legends that originated from it, why aren t these Creation stories believed anymore?

Creation Myth - Primordial gods

It all started with inexplicable forces that were present even before the beginning of time and space. They were the first primordial gods: Chaos, Gaia, Tartarus and Eros. These four deities (deathless gods and forces of creation) are often depicted as a realm or a place. They are sometimes pictured or mentioned in their personified forms.

Chaos - The Origin

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The first deity to ever exist was Chaos. Chaos was the nothing that existed before everything. It was the emptiness, the void, a state of conflict or disorder. It was the genderless form from whence everything else was born.

After Chaos, came Gaia (Earth), then Tartarus (Underworld) and finally Eros (Procreation). Gaia was the female personification of the Earth, which would later become the foundation for all the other gods and the mortals. Tartarus was the stormy space beneath the Earth, a bottomless abyss. And Eros represented the love of sexual reproduction and was the fairest of the four deathless gods.

These four primordial gods were only the beginning. Chaos gave birth to Erebus (Darkness)- the male personification of darkness and the space between Tartarus and Gaia, and Nyx (Night)- the goddess of the night. Erebus and Nyx procreated to give birth to Aether (Brightness)- the bright upper atmosphere of the gods, and Hemera (Day)- the goddess of the day.

Chaos and Gaia

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Then Gaia, through parthenogenesis, gave birth to Uranus (Heaven), The Ourea (Mountains) and Pontus (Sea) to complement and protect her. Uranus and Pontus were male gods, with whom Gaia would eventually mate to give birth to a whole new number of different beings and personifications.

The order in which the Primordial Gods were born is debatable. Some sources state that from the initial state of disorder that was Chaos, eventually Love (Eros) appeared. Chaos, being poetically female in this version, with Love, gives birth to Gaia and the following primordial deities.

These were the primordial forces before the generations. You can say they were always there, but that at some point materialized, started a chain of events that led to creation and gave form to the first generations of gods. Uranus, as the Heaven and protector of Gaia, was the ruler of the Cosmos at this point.