One point Neal Stephenson makes in The Baroque Cycle is that people from (Western) Europe in the 17th and 18th centuries used the term “Christendom” to refer to Europe, rather than Europe.
I like the term “Christendom.” It gives me a better idea of what most people in the West are thinking about when they use like “the West”, “First-World countries,” and “developed nations.”
It could make the news a lot more obvious: “Christendom gave $100m to tsunami victims,” for example. Christendom is running out of oil.