While piling fortunes in gold and jewels on skeletons to make shrines to worship at, hidden away in churches is obviously a hit with some Catholics.
To me it makes me think of post apocalyptic scifi/horror movies when they discover a totally mind blown cult living underground, that has gone totally crazy.
...or, as I suspected, you folks aren’t very well travelled or avoid those awful, evil Catholic churches when you do tour, or never crack open an art book.