Start by learning the history of term, to understand that there was likely no
offense intended. X is an abbreviation for Christ, arising from the Greek term
Christos, which starts with a Greek Chi, written as X. This usage dates back
to the 1500s. Thus, the usage is not an attempt to "blot out" the name, or be
offensive. However, it is worthwhile to note that for some, even with the
historical basis, the term remains offensive.

It should also be noted that some common Yiddish usages, although just a
shorthand for many, are considered offensive by some. A good example is the
word "shicksa".

Those wishing to avoid offending those bothered by terms such as these might
consider choosing alternate phrases.