Here is the basic story according to Joseph Smith within the context of the evidence I presented:
According to Joseph Smith, the Nephites and Lamanites came to the Americas around 600 B.C. They were preceded by the Jaredites. The Lamanites are the only civilization that survived and are the ancestors of the American Indians. Soon after Jesus crucifixion and resurrection, He visited these peoples in the Americas and preached to them His gospel. Despite the fact that Jesus, our Lord and Savior, told His disciple Peter that he was the Rock upon which He would build his Church and the gates of hell would not prevail against it, Joseph Smith tells us that the church did fall into apostasy around 100 A.D.
Then God waited for over 1700 years until 1830, before sending the Angel Moroni to reveal the golden plates to Joseph Smith in order to restore His true church to the earth. Of course, the golden plates are too precious to leave on earth, so they are taken back to Heaven when Smith completes their translation. Now, this new scripture does not contradict the major beliefs of the Christian churches of the time. It maintains that there is and always has been only one God, which consists of the Father, Son, and Holy Spirit. This, of course, precludes the ability of men to become gods. It also asserts that polygamy is an abomination to God. The Book of Mormon, Joseph Smith tells us, is the most correct of any book on earth, and the keystone of our religion, and a man would get nearer to God by abiding by its precepts, than by any other book.
Then, only five years later, Joseph Smith purchases some Egyptian papyri from a Mr. Michael Chandler, who is traveling around with an exhibition of Egyptian mummies. Smith claims that the papyri contain the Book of Abraham, written by Abraham himself. It is in this scripture that God reveals many of the beliefs and practices of the current Mormon church, none of which are supported by the Book of Mormon and generally contradict it.
These contradictions are not insignificant. Notice that Mormon missionaries ask potential converts to read the Book of Mormon and pray about it to determine its truth. If you accept it as true, then you must also acknowledge that Joseph Smith is Gods prophet. If you believe Smith is a prophet, you cannot challenge his later revelations, even when they contradict the Book of Mormon itself. So what are we to believe? Did God send the Angel Moroni to deliver the sacred golden plates containing the Book of Mormon to Joseph Smith, plates so sacred that they had to be taken back to heaven? Then only five years later, did God guide the Book of Abraham, encoded in an Egyptian burial text on papyrus, to Joseph Smith through a traveling mummy exhibition and reveal new truths contradicting the sacred Book of Mormon?
Both scriptures cannot be true, especially since they contradict each other on the basic nature of God. If only one of these scriptures were true, you'd have to believe that the one delivered by an angel and returned to Heaven was it. But, given that the same prophet revealed both of them to us, one can only conclude that both are false.
I've presented multiple contradictions between what Mormons believe and what the Bible teaches. In most of those cases, I've shown similar contradictions with the Book of Mormon and other Mormon writings. The major Mormon beliefs are in complete opposition to everything established by the Old Testament prophets and confirmed by Jesus. Furthermore, I've demonstrated that the Mormon claim of revelation is insufficient to support their beliefs.
Though these hurdles can be lowered under Mormon apologist rationalizations, they are hardly overcome. The consolidated evidence, I believe, demonstrates beyond a reasonable doubt that Joseph Smith was no more than a crafty, charismatic con-artist; that the Book of Mormon is pure fiction. The Mormon religion is therefore disproved.