The funny thing is that every other Christian denomination in America sees the Mormons as heretics and there is a very good reason why most Mormons only live in Utah.
Now the other Christian denominations have their differences (Catholics, Orthodox Christians, Protestants, Evangelicals, the list goes on) but if there is one thing that the other big Christian denominations agree with is that Mormons are heretics.
The Mormons believe that somehow God decided to move away from Israel and decided to go to America (a land that has no religious significance or historical context in any of the Abrahamic faiths) where a man claimed he saw God and Jesus speak to him and then claimed that an angel named Moroni (who is not canon in the Bible itself and not seen as canon in any other Christian denomination) where he told Joseph Smith that he should find some gold plates that contains new DLC for Christianity and giving him instructions on how to translate these manuscripts (which is obvious this is a total lie Joseph Smith said to justify his new religious movement). Also the Native Americans were Jews from Israel and they originally had white skin but after some mass murder later, God punished the Native Americans by turning their skin red (I think the Mormon Church would do some revisions to make this story less racist but this is what the followers of the Mormon religion believed in for a long time).
It was also obvious that Joseph Smith was a horny guy where he clearly wanted to belong to a religious Institution that allowed polygamy. Joseph Smith wanted to be technically be called a Christian where he would also be allowed so he can have lots of pussy. and this was during the time when the other Christian demonstrations began to phase out of polygamy while Joseph Smith wanted an excuse to be married to multiple women. While it is unfair to compare modern standards to how people lived in the past, it's also worth nothing that Joseph Smith married a 14 year old girl named Helen Mar Kimball along with marrying several other prepubescent girls. Joseph Smith did said to Helen Mar Kimball and I quote, "God says you should marry me, you and your family will be exalted to heaven" and I'm not making that up; Joseph Smith did this to a 14 year old girl at the time. Joseph Smith is to the Mormons what Muhammad is to Islam (the story of Aisha). When you bring this up to Mormons, the Mormons are often high on copium in regards to Joseph Smith marrying underaged girls in the same way Muslims get high on copim whenever the topic of Aisha gets brought up.
The Book of Mormon is also regarded as a modern day version of Apocrypha (religious texts that are not seen as canon in the Bible). While some Christian denominations do accept some Apocryphal (or Deuterocanonical if you are Catholic or Orthodox) works as canon; generally speaking no other Christian Demonstration recognizes the Book of Mormon as canon. For Christians outside of Mormonism, there is no more holy scripture after the New Testament (it's seen as heretical to think there is anything more after the New Testament).
Joseph Smith was a con artist that clearly wanted political power and he also wanted lots of pussy. Every other Christian denomination see the Mormons as a bunch of crazy weirdos (the Book of Mormon is not seen as canon in the Bible as far as every other Christian denomination is concerned) in the same way the Jews sees the Messianic Jews as weirdos (because Jews do not believe in Jesus) and in the same way Muslims see the Nation of Islam as weirdos as well (Muslims do not accept Yakub as canon in the Islamic faith and even find that story really dumb).