How to Say "christendom" in Spanish
The Spanish word for “christendom” is “cristianismo” — B1 level. This is a very common word in everyday Spanish.

Examples
El cristianismo tiene muchos seguidores en España.
Christianity has many followers in Spain.
Estamos estudiando la historia del cristianismo en la universidad.
We are studying the history of Christianity at the university.
Muchos valores occidentales están influenciados por el cristianismo.
Many Western values are influenced by Christianity.
Gender Memory Aid
Words that end in '-ismo' are almost always masculine, so you will always use 'el' or 'un' with this word.
Using the Article
In Spanish, we usually use 'el' (the) when talking about Christianity in general, even when English doesn't use 'the'.
The Gender Trap
Mistake: “La cristianismo es antiguo.”
Correction: El cristianismo es antiguo. (Remember: -ismo words are masculine!)
Related Translations
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