Yes, the Catholic Church has contributed a lot in the way of art. However, some of the outfits seen on the carpet tonight are just plain sacrilegious, especially considering most of these people are not practicing Catholics. Rihanna was seen dressed as the pope, wearing a short, jeweled dress and a papal mitre (tall hat that the pope wears). Chadwick Boseman and Jared Leto were wearing some priest-like attire. Many others appeared wearing dresses, suits, and accessories showing various crosses and Catholic imagery.
Here's what really gets me about this whole thing, if any white person wears anything of a non-white culture (i.e. that one girl's Chinese prom dress and various Halloween costumes that get "banned" every year) it is considered cultural appropriation and everyone loses their minds over it. Yet, here we have a bunch of non-Catholic people wearing a bunch of Catholic outfits and images, some of which are very sacrilegious and not okay, and they're being praised for it. It doesn't make sense. How much more hypocritical can Hollywood and the media get?
We need to make a choice. Is "cultural appropriation" okay or isn't it? It can't be okay for some people and not for others. That's not how this works. If you're going to tell a teenager she can't wear a dress she finds beautiful to prom because she's not Chinese, or tell little girls they can't dress as Moana or Pocahontas for Halloween because they're not Polynesian or Native American, you shouldn't praise celebrities for turning the Catholic faith into a fashion statement.
Your culture can't be my Halloween costume, so my religion can't be your fashion statement. Simple as that.