The book of Mormon is as true as the Bible.
Actually, the BoM has a BIG PROBLEM, its historic, you can see the evolution of its leadership & core beliefs, there were trial transcripts, diaries, newspaper articles, shipping & steerage records & burial sites (with decomposing human bodies)
since BoM is the foundation stone on which JS jr.& the LDS based their claims upon, I'll shred it a little for easier digestion:
1. claims to be the history of the Americas circa 600 BC to 400 AD
2. just on DNA evidence, proves the BoM false
3. includes many anachronisms; horses, metal work, Old World ag
4. linguistics proves it wrong
5. archeology proves it wrong
6. claim to be the restored Primitive church of the early Christians, yet no evidence of ancient Mormon temples, rituals, liturgy, clergy, or wards uncovered here or in the Middle East
7. no evidence of Reformed Egyptian, the language of the BoM
++++7a. as a corollary, the translation of the "Book of Abraham" hieroglyphics from a papyri disproves JS jr's Egyptian translating abilities
It should be quite obvious that present scholarship has revealed that Joseph Smith did not translate the Book of Abraham by the power of God as he had claimed. It follows that if he did not translate the Book of Abraham by the power of God, then it would be very easy to conclude that he did not translate the Book of Mormon by the power of God either.
When Joseph first gave his translation, hieroglyphics were undecipherable. Today they are. He was safe in saying anything he wanted to and there would be no way of proving him wrong. But with the resurfacing of the same papyri he used to do his Book of Abraham translation, and the fact that he did not in any way do it correctly, should be proof enough
from: http://www.carm.org/lds/ldspapyri.htm
burial site
Joseph and Hyrum Smith's bodies were returned to Nauvoo the next day. The bodies were cleaned and examined, and death masks were made, preserving their facial features and structures.
A public viewing was held on 29 June 1844, after which empty coffins weighted with sandbags were used at the public burial. (This was done to prevent theft or mutilation of the bodies.) The actual coffins bearing the bodies of the Smith brothers were initially buried under the unfinished Nauvoo House, then disinterred and deeply reburied under an out-building on the Smith homestead. The exact location of the gravesite was soon lost to memory.
In 1928 Frederick M. Smith, president of the Reorganized Church of Jesus Christ of Latter Day Saints and grandson of Joseph Smith, fearing that rising water from the Mississippi River would destroy the gravesite, authorized civil engineer William O. Hands to conduct an excavation to find Joseph and Hyrum's bodies. Hands conducted extensive digging on the Smith homestead, and located the bodies, as well as finding the remains of Joseph's wife, Emma, which had been buried in the same place. The remains—which were badly decomposed—were examined and photographed, and the bodies were reinterred.
from: http://en.wikipedia.org/wiki/Death_of_Joseph_Smith,_Jr.