Mew, if you were to compare it, looks very similar to a fetus. Mew is the ancestor to 95% of all exsisting Pokemon.
Arceus is not the 'God' Pokemon. It created, at the most, seven Pokemon; Dialga, Palkia, Giratina, Azelf, Mesprit, Uxie, and Mew. Then it disappeared. Im saying it only created those seven because Mew is the ancestor to most Pokemon, so what sense would it make if Arceus simply created all of them?
I still think Lugia and Ho-Oh are representations of Amaterasu and Susanawo, it just makes the most sense to me.
As for Zapdos, I'm quite tired of hearing that Zapdos is the Poke-version of Zeus. If that were true then Zapdos would be a potent deity, not part of a triple who's purpose is nothing more than to be captured (You don't need Zapdos to do anything important and it doesn't serve much purpose). Zapdos simply exsists to exsist, much like Articuno and Moltres.