QuoteThe theory or attitude that physical well-being and worldly possessions constitute the greatest good and highest value in life. And concern for possessions or material wealth and physical comfort, especially to the exclusion of spiritual or intellectual pursuits.
And this materialism.
QuoteThe theory that physical matter is the only reality and that everything, including thought, feeling, mind, and will, can be explained in terms of matter and physical phenomena.
You choice of Madonna is interesting. She has always liked to mock religion with upside down crosses and such. This pisses many people off. She had some friend who was doing something in a Satan outfit last year. I don't know or care about the details of that. Wearing a devil suit to piss religious people off seems childish to me.
Madonna's materialism is hedonism. The philosophy of shiny objects, having nothing to do with me saying we have no free will, and you saying we do.