That's not Christianity, that's almost entirely capitalism post 2007. There was lots of shit to do back in the day. Like they still have fireworks wars between cathedrals in Greece or Turkey or somewhere over there. People dress up in wierd outfits for processions. There are literally saints days for every day of the year if you want to have feasts. There are flagellants who march through the streets whipping themselves bloody. There's Dia del muertes, there's santeria, like I cannot even begin to begin to begin to list all the weird funky shit Christians do in various parts of the world. Even in America.

America specifically has like 0 fucking collective practices that encourage people to interact outside of their nuclear family group

This is a really recent phenomena. Like 21st century. There's an old book called "Bowling Alone" from like 20 years ago that looks in to the decline of community in the late 20th century, and it's gotten much worse much much faster in the 21st century.

I think you might be conflating big picture Christianity with like Baptists and Mormons and Christian Fascists and idk, maybe Lutherans. Christianity as a whole is fucking nutty. Like Carnival, with all the beautiful people in the sequins and feathers, and the drinking and the dancing, all that? That's a Christian festival where people are basically getting it all out of their system before Lent starts.

Like back when I was a kid we'd all go to the local Catholic church and sing "traditional" Irish songs and folk music and rebel songs and shit while everyone go drunk.

There's an old Joke that Protestants are allowed to fuck but don't fuck, and Catholics aren't allowed to fuck but fuck all the time. Like Protestants tend to be boring Calvinist shits, but other denominations party.