Actually, a nation of Christendom is any country where the main religion purports to be Christian.
It's easy to write off an entire country as a bunch of evil doers by classifying it as "a nation of Christendom". While it still makes some sense to say Iran is "a nation of Islamdom", I wonder which western country could be nowadays described as a "nation of Christendom". The only Chritian-like thing most citizens of such "nations" have in common is perhaps Christmas, which is also "celebrated" in one form or another by most atheists anyway.
Czech Republic is 60% atheist, so is it a nation of Christendom?
Poland is said to be 94% Catholic, but if you ask real people around, it turns out that you have 10-20% of zealots, 10-20% of relatively active Catholics (many of them elderly anyway), and the whole rest of "inactive" Catholics, atheists, agnostics and other.
The term "nation of Christendom" is an archaism which has been used by the WT for at least the last 55 years and has lost sociological validity. They should update their lingo. Just look at this gem from the 1950s. Doesn't it ring the bell? THe same propaganda, same labelling, same stereotypes:
*** w50 3/1 p. 68 A Call to Praise ***
Nevertheless, in the nations of the earth, particularly in Christendom there is today a great pretense at praising God. Imposing church buildings and temples are everywhere to be found, with paid clergy to direct man?s praise.
Pole