First American pope elected and will be known as Pope Leo XIV

Most Christians are not Catholics, though it's close and recently was true.

https://en.wikipedia.org/wiki/Christian_denomination says just less than half of Christians in 2024 were Catholic (48.6%), down from 50.1% in 2011.

He no doubt means the largest Christian church (though from a Catholic perspective, there is only the Church and those who are in schism, heretics, etc.).

I think the relationship stays with the orthodox churches is “It’s complicated.”