The Mormon faith is only documented by one person. The Christian faith is documented by many, and far more documented, as well as better, than the Mormon faith.
Sorry I should have been more specific, the evolution of the faith is documented by newspaper accounts, photographs, and personal diary's of those on scene as it was unfolding to non believers and believers alike.
The early settlers of Utah were by some accounts blood thirsty and violently protective of their new land, at one time people needed an army escort to travel unmolested with in 50 miles of their settlements.
The Christian faith is as well documented as it can be with mortal men censoring the records a thousand years after the fact. We have to look back a few thousand years to attempt to visualise the society of the time, some gone with no explanation. We find the ruins of city's that held thousands of people at one time and to even try to guess who they were use the Bible to make an educated guess.
The Mormons however came into being in the age of technology, with photographic evidence and the printing press, Heck when Custer died his widow was left huge telephone bills. Hard to believe the East had electricity and the automobile of sorts in a time when men fought the Indians on horse back and most of the West was still wild held by the Indian tribes.
The Book of Mormon makes a good read, funny as all get out when something is reported as fact and we know this is an impossibility at that time, but, still interesting.