As of this writing, the site seems to be down, but the UN has a style guide that includes a dictionary of commonly-used words whose spelling needs to be standardized. Even though the guide says it uses the Concise Oxford English Dictionary as its default authority on spelling, some words are used so often that the style guide can be used to save time from looking them up in the dictionary.
One such word is "Judaize."
The UN websites use that word over a thousand times. As far as I can tell, it is always in the context of Israel wanting to "Judaize" Jerusalem (or, as many UN documents call it, Al Quds.)
"Judaizing" Jerusalem is like wetting water. But thanks to efforts of those antisemites who want to cut all ties of Judaism to Jerusalem, like the UN, the word has become a pejorative.
Needless to say, "Islamicize" and "Christianize" are not words that are needed in the UN spelling style guide.
(h/t Irene)