And we'll probably never have a good answer to any of it. It's incredibly problematic to try and unravel symbolism, and any guess is only a guess.
Fascinating stuff.
Indeed. There are very few data points, since finds are scarce. I can imagine a scenario from a million years from now when our descendants return from space to an Earth that has finally lost enough radioactivity (from the nuclear wars of the late 21st C) to be explored. They might dig up an ancient Catholic shrine that avoided complete annihilation with the inscription "Mary, Queen of the Universe" still readable, and, excavating therein, find a statue of Mary along with paintings of her preserved under a dense layer of dust. One wonders what hypotheses that single data point might generate.