Your Book of Mormon most definitely goes into the fiction section of my library.
It’s in my Alternative Religion section.
In my estimation ALL religions, after the ‘facts’ about them are proven, have things inherent in them that MUST be taken on faith.
Whether it’s the FSM or Jesus raising from grave, it’s the unproveable things that one has to have faith in to achieve the final reward promised by the god(s) of the religion.
If people want to ‘believe’ the words and writings of Mormon prophets, or celebrate Festivus or Kwanza - then it’s on them.
Likewise if people want to ‘believe’ the words and writings of CHRISTIANS down thru the ages - then they will receive the reward promised to them.