I disagree. Writing more than 65 years ago, Brodie was basically ignorant of the occult influence on Smith (plus she had her own fish to fry). And Bushman is a Mormon.  He doesn't like to be called an apologist, but he isn't beyond trying to slip by the tough places in the story if for no other reason than to keep the General Authorities from too obviously lifting their eyebrows.  For that reason I think the opening chapters of Rough Stone Rolling are the weakest in the book.