[alanh]

Careful of the No True Scotsman fallacy. It’s super common for people in certain groups (e.g. Christianity) to say, “Oh, but real Christianity doesn’t believe or condone X, Y, or Z” while, in fact, huge numbers of people who self-identify as members of that group do, in fact, believe or do X, Y, and Z.

[nthj]

Sure. But it's just as fallacious to assume an author is contradictory because “Christianity” was redefined in another country after he already died.

Words can have different meanings depending on context, that's normal, but just like when we're writing software, we have to establish the context before we'll get anywhere.