English is a clanking Germanic language that’s borrowed so many Romance words that Italian is one of those languages that, if you just stare at it long and hard enough, magically turns into English (albeit English with funny spelling). Like one of those optical-illusion picture things.
The Catholic religion is a set of beliefs. The thing you have to do to be a Catholic is to believe those beliefs. It’s not an ethnicity. It’s not a nationality. It’s really that simple. Counterpoint: Bad Catholics are not Modernists.