I'm not quite sure what to make of this:
In summary, it suggests that the Garden of Eden tree is Fly Agaric and that Ezekiel and Revelations were written under the influence.
Also that early Gnostic Christians had Shaman tendencies.
It seems too good to be true, but Ezekiel and Revelations do read that way and the artwork does look like a mushroom.
Anyway, an interesting idea at the very least.