zerinus wrote:When we say that the Book of Mormon is "true," we mean that all the propositional statements we make about it are true.
Nope. You really are confusing yourself here. The propositional statement about the Book of Mormon 'The Book of Mormon says the moon is made of green cheese' is false.
You could have said "we mean that the propositional statements that the text of the Book of Mormon makes or implies about historical facts and religious doctrine are true." That would have expressed your meaning: it would also have been false, but hey ho! Nobody ever expected you to talk sense ...