Do you believe the Book of Mormon?
The BoM was "translated" supposedly from physical plates of gold that then mysteriously disappeared. So we only have Joseph Smith's word that is what happened. The original "translation" was covered in so much secrecy that it's hard to take seriously. Scripture, though, is very publicized and non-secret--even the original writings are public and available for everyone to view and read.
The BoM has undergone s lot (more than a few) content revisions through its history.
The BoM originally declared a large portion of humans to be cursed merely for the color of their skin.
There are so many things wrong--content-wise--with the BoM that is doesn't even compare with the Bible.