I intended on writing a full Christian response to Mormon teaching but I’ve chosen to provide you with more of a reading and viewing list instead. If you are at all interested in knowing what Mormons believe please do yourself a favor and check out these sources. I guarantee you’ll be glad you did.
For brevity sake, I’ve intentionally kept this list short. Please view each section, preferably in the order in which they appear. Again, I guarantee you’ll be glad you did.
Mormonism in a Nutshell
What Does Mormonism Teach?
This is a must read article. All beliefs are sourced from Mormon documents. It’s important to remember that the teachings of LDS presidents, beginning with Joseph Smith, then to Brigham Young, etc., are viewed as official Mormon doctrine. Since the LDS church has living “prophets” today—the First Presidency and the Quorum of the Twelve Apostles—their theology continues to take new shapes. For example, from its inception blacks weren’t allowed to enter the Mormon “priesthood” but in 1978, certainly due to outside pressure, official leadership changed its mind.
Behind the Veil: Never-before-seen videos of secret Mormon Temple Rituals (An absolute must see!)
What Mormon Missionaries Don’t Tell You (Another absolute must see!)
The Nail In The Coffin
The nail in the coffin is not Joseph Smith’s demonically charged call to restore the truth , his insatiable appetite for treasure hunting , his deplorable polygamy and sexual cravings , or his false teachings and lies . Mormonism’s nail in the coffin is their founder’s false prophecies. It’s been said that if someone claims to be a prophet that person is one. The question is, is that person a true prophet of God or false prophet? If a true prophet, none of his words will fall to the ground; all his words will come to pass (see 1 Samuel 3:19).
Again, Joseph Smith is either a true prophet of God or a false prophet. If a true prophet everything he proclaimed had to come true. If not—if only one prophecy failed to come true—then Joseph Smith did not speak for the LORD and is therefore proved to be a false prophet (see Deuteronomy 18:20–22). Please read the following article and decide for yourself whether Smith was a true prophet of God or a false prophet. Remember, if Smith failed even once then so does the religion he made up.
Joseph Smith’s False Prophecies
Interesting Mormon “Truths”
1. Joseph Smith claimed to have done more to keep a church together than Jesus
“I have more to boast of than ever any man had. I am the only man that has ever been able to keep a whole church together since the days of Adam. A large majority of the whole have stood by me. Neither Paul, John, Peter, nor Jesus ever did it. I boast that no man ever did such a work as I. The followers of Jesus ran away from Him; but the Latter-day Saints never ran away from me yet.”
Joseph Smith, History of the Church, 6:408–409
Is a true prophet of God really going to claim to have done more to keep a church together than the Son of God? Smith’s statement is at best, supremely arrogant, and at worst, damningly indicting.
2. Joseph Smith claimed the angel Moroni  revealed the location of the “golden plates” and “Urim and Thummim,” after which he translated the “reformed Egyptian” on the “golden plates” into Elizabethan English.
Interestingly, no one except Joseph saw these “golden plates”  and “Urim and Thummim,” not even Joseph’s scribe Oliver Cowdery, and, of course, the “angel” Moroni just happened to take the plates after Joseph was finished with them. Further, no linguist has ever encountered “Reformed Egyptian.” The whole story surrounding the book of Mormon therefore seems perfectly contrived. Lastly, I, and surely others, find it interesting that Joseph translated (in 1827–1829) the “Reformed Egyptian” into (1611) Elizabethan King James language. Hint: see next Mormon “truth” claim.
3. Joseph Smith claimed the book of Mormon was the most correct book on earth
“I told the brethren that the Book of Mormon was 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.”
Joseph Smith, History of the Church, 4:461
The book of Mormon claims to be an historical account of peoples from the Middle-East who migrated to the Americas. It supposedly gives history from 600 BC to AD 421. However, the book of Mormon…
purports that iron, copper, brass, and steel were used in the Americas during 600 BC–AD 421 (Jarom 1:8; 2 Nephi 5:15) yet these were not introduced until 1492
purports that cattle, oxen, cows, sheep, swine, goats, horses, asses, elephants were found in the Americas during 600 BC–AD 421 (Ether 9:18–19) yet these also weren’t introduced into 1492
purports that great civilizations rose and fell yet no archaeologist has ever discovered any such evidence
purports that the Messiah will be born in “Jerusalem” (Alma 7:9–10) yet the Bible unequivocally points to “Bethlehem” (Micah 5:2; cf. Matthew 2:1)
purports to be inspired scripture yet contains many blatant plagiarisms (which explains Joseph’s translating into Elizabethan language used 200 years before), such as Mosiah 14/Isaiah 53 and 3 Nephi 13/Matthew 6
I could carry on demonstrating that the book of Mormon is one of the most “incorrect” books of any on earth but I think you get the point.
4. Joseph Smith died a martyr
It’s true Joseph died a martyr; he was certainly unwilling to forsake his belief in polygamy. The Nauvoo Expositor was on the verge of revealing Joseph’s deplorable polygamy when he ordered the printing press to be destroyed. As a result, Joseph and his brother, Hyrum, were placed in a Carthage, Illinois’ jail awaiting trial. On June 17, 1844, however, some 200 men burst through and killed Joseph and his brother. This action was despicable. Regardless of Joseph’s and Hyrum’s culpability they should not have suffered death in this fashion. What is curiously silent among our Mormon friends, however, is that Joseph went out with a gun blazing and killed two in return. Sometime before Joseph and his brother were killed they were offered a six-shooter which Joseph gladly accepted. If you’re interested in learning more consult a search engine or simply visit the following link: http://www.i4m.com/think/history/carthage-jail-smith.htm
I ask all those reading this to consider whether Joseph Smith meets the moral requirements to serve as a prophet of God. I further ask all those reading this to consider whether Joseph Smith can serve as a prophet of God in light of his numerous false prophecies.
 Read Joseph’s own account of events immediately preceding his so-called “first vision” in “Joseph Smith—History 1:14–19” in “The Pearl of Great Price.” His own record will likely lead you to believe, as do I, that it wasn’t God the Father and Jesus Christ who appeared to him but rather demons disguised as angels of light (see 2 Corinthians 11:14; cf. Galatians 1:8–9).
 Mormons surely will deny their founder’s addiction to treasure digging but his fascination with the occult is beyond dispute. I could point you to statements revealing his appetite for treasure digging but let me simply direct you to the court case entitled State of New York vs. Joseph Smith. On March 20, 1826 Joseph Smith was charged with “glass looking.” It was a misdemeanor at the time for which Smith was ordered to pay a fine of $2.68. If you’d like to investigate this yourself simply type in the above court case into any search engine or visit: http://www.fairmormon.org/perspectives/fair-conferences/2002-fair-conference/2002-the-1826-trial-of-joseph-smith.
 The Mormon Church has finally admitted to their founder’s penchant for wives. Smith married at least 40 women, some of whom were currently married and one as young as 14. Again, if you’d like to investigate this yourself simply look online or visit: http://www.nytimes.com/2014/11/11/us/its-official-mormon-founder-had-up-to-40-wives.html?_r=0. To put it bluntly, Smith was a man given to sexual impulses. To give you an example, his wife Lucy once went looking for him and through a crack in the barn door found him lying with 16 year-old Fannie Alger. For a list of Smith’s sexual deviances visit http://exmormon.org/phorum/read.php?2,386393,386597. Smith clearly rejected Jesus’ teaching on “one flesh” marriage (see Matthew 19:3–10). In my mind, Smith’s penchant for wives and sex tell me that he cannot seriously be trusted as God’s final mouthpiece.
 See above “What Does Mormonism Teach?”
 In the first edition of “The Pearl of Great Price” (1851) Joseph identifies this angle as “Nephi.” The translators of the “Book of Mormon” neatly took care of this discrepancy and changed “Nephi” to “Moroni.” Later editions of “The Pearl of Great Price” reflect this editorial clear-up.
 Near the front of the book of Mormon there is a statement suggesting that Oliver Cowdery, David Whitmer, and Martin Harris “saw the plates,” but interestingly Martin Harris confessed to not seeing them with his literal eye but rather with his “spiritual eye.” These three men later rejected the LDS faith to the embarrassment of the Mormon faithful. Missionaries attempt to cover this up by saying that Oliver Cowdery and Martin Harris were re-baptized into the Mormon faith.
Matt Slick's "Christian Apologetics and Research Ministry" (carm.org)
Walter Martin's "Kingdom of the Cults"