Even if they thought it was going to be neutral, it sounds like to me the publisher believes neutral means that the author must ignore any facts that are positive, even if they are true. Especially since they wanted to ban certain words from the books. You really can’t cover a history of Christianity without mentioning “Antichrist”, and the other words listed. You would have to leave out important parts of the history, which seems ridiculous for an encyclopedia. I wouldn’t be surprised in this day and age if they publishers have no clue what the history of Christianity really is (not the P.C. version) and didn’t know what they were agreeing to. Which isn’t an excuse if they had a contract, IMO.
This is nuts - as most things are these days.