>>13471898its interesting you bring ziz into it.
Yes, Kyogre and Groudon are based on the Behemoth and Leviathan from the book of Job, but they don't represent Earth and Sea, but they rather represent the "strongest" creatures in the earth and sea. They are used to describe how strong He is, to the point that even they obey him, and humans are extremely weak.
Ziz it is interesting. He is not really on the trio, he comes on the book of Psalms, which is way later chronologically. The Bible doesn't say much about it, but Jewish tradition describes it as a gryphon like thing that was able to cover the sun with its wings.
I really do not know why they used quetzalcoatl for the design, since it is from Mayan origin.
did i mention than this friend of mine is a theologian as well?
Also, sorry for all this 