What did mormon church founder joseph smith say the gold plates reveled to him

The Book of Mormon which he translated from the original 'reformed Egyptian' language.

Joseph Smith found the gold plates in September 1827 (after his 4th attempt) and that he was directed to find them on a hill near his home in NY by an angel.

told him not to join any Christian denominational churches

dylan has written many enduring songs and he has received several awards for his musical achievement;  

any written work with artistic value can be considered literature; especially if such work is publicly recognized, and has had importance and endurance among people; whether is poetry or fiction or drama or even criticism, since it's the transcendence and representation of a culture, language or people in a period of time to more people, using letters (words), regardless the subject.

the nobel prize in literature is given to authors from any country based on a body of work as a whole that inspires and nurses the life of humanity.  

and the work of bob dylan matches that description, therefore is well deserved since he'd created new poetic expressions within the american song tradition, that has inspired and influenced the lives of many people, not only withing the united stated but worldwide as well.