I would assume that they, and those of their kind, have been the various "gods" of different cultures throughout time. As for your argument that Isis and Artemis are two very different gods; Although this might be true, people can view the same thing very differently. The Sun was considered a god also, and you can see how many forms Sun Gods have taken in various cultures throughout history, but all are based on the same object.
the sun is not a living being with abilities though. it's like making the sun god someone who worships the frost.
In Greek mythology, Artemis [(Greek: (nominative) Ἄρτεμις, (genitive) Ἀρτέμιδος
] was the daughter of Zeus and Leto, and the twin sister of Apollo. She was the Hellenic goddess of forests and hills, and was often depicted as a huntress carrying a bow and arrows.[1] The deer and the cypress were sacred to her. In later, Hellenistic times she even assumed the ancient role of Eileithyia in aiding childbirth.
Artemis was one of the most widely venerated of the gods and one of the oldest (Burkert 1985, 149). Her later association with the moon is a popular idea which has little foundation. She later became identified with Selene,[2] a Titaness who was a Greek moon goddess, and she was sometimes depicted with a crescent moon above her head. She also became identified with the Roman goddess Diana[3] and with the Etruscan goddess, Artume. [4]
Isis is a goddess in Ancient Egyptian mythology and is celebrated as the ideal mother and wife, patron of nature and magic; friend of slaves, sinners, artisans, the downtrodden, as well as listening to the prayers of the wealthy, the maiden, the aristocrat and emperor.[1] In union with her husband and brother Osiris she conceived Horus. Isis was instrumental in the resurrection of Osiris when he was murdered by Seth. The goddess Isis was the first daughter of Geb, god of the Earth, and Nut, the goddess of the Overarching Sky, and was born on the fourth intercalary day.[2]
She is also known as the goddess of simplicity, from whom all Beginnings arose, and as the Lady of bread, of beer and of green fields. Ancient Egyptians believed that the Nile flooded every year because of her tears of sorrow for her dead husband, Osiris
she fits Isis's description very well.. but Artemis was the part that through me for a loop, because i know my greek mythology pretty decently.
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