Or should I say does any Mormon have scripture to back that up?
Depends on what you mean by Scripture!
They have WRITNGS and SAYINGS that are NOT found in the BoM.
Not ONLY do you have to believe that the Bible we have today was 'editted' (ahem) by church leadership thru the ages, but the 'completed work' needed a bit more stuff added by Joseph Smith and others!
There are OTHER 'beliefs' that only the TRUE seekers find out: in their Temple Ceremonies.