Greek religion was polytheistic. And in practice it included a far wider range of deities than our popular imagination would suggest
Probably no two Greeks followed the exact same cults
There were many Athenas! And even many Poseidons, Zeuses, Heras, and more.
She is not Athena Parthenos (the virgin), worshiped at the Parthenon, who was different from that of Athena Nike (victory), both in Athens, who different from Athena Alea who was worshiped in Arcadia (temple at Tegea)
It’s a real mish-mash of deities/cults. Each with their own stories, rituals, and constituents (based on kinship, citizenship, or choice)
Many Greeks comfortably worshiped Isis and Osiris (Egyptian deities), Mithras (Persian), and Cybele (Phrygian). Some foreign deities were correlated with “Greek” deities (Astarte = Aphrodite = Venus).
Burned bones show both and even more varied practice in different places and times
Polytheism was different from modern concepts on monotheistic religions. Few cults invoked questions of faith or belief. It was about myths, practice & rituals