Mormons believe that Jesus is Jehovah, (the LORD in most versions of the Old Testament). I would certainly agree with them on that. Since that is the case, it becomes very easy to refute most of what they believe about Jesus.
Those who adhere to the teachings of Mormonism believe Jesus hasn’t always existed. But Psalm 90:2, referring to Jehovah, says, “…even from everlasting to everlasting, thou art God.” They say you should only pray to the Father, but throughout the Old Testament, people prayed to Jehovah (Genesis 25:21 says, “Isaac prayed to the LORD on behalf of his wife, because she was barren. The LORD answered his prayer, and his wife Rebekah became pregnant.”)
Latter-day Saints also believe at least three gods exist: The Father is a god called Elohim, the Holy Spirit is a god, and Jesus is a god. According to the Bible, however, before Jehovah there was no God formed, nor will there be after Him (Isaiah 43:10).
Clearly, whoever came up with the concept that the Father is Elohim and Jesus is Jehovah had zero knowledge of Hebrew. Elohim is the Hebrew word for God, and Jehovah is God’s name (Psalm 83:18). There are dozens of verses that claim Jehovah is Elohim. Deuteronomy 4:35 says, “Unto thee it was shewed, that thou mightest know that the LORD [Jehovah] he is God [Elohim]; there is none else beside him.”
Furthermore, a belief in three separate gods makes mincemeat out of the first of the Ten Commandments. The first commandment (Exodus 20:3) says, “Thou shalt have no other gods before me.” Jehovah wrote that with His finger in stone. If that is Jesus speaking, as the second god, is it blasphemy for Him to say that we should have no gods before Him? What about the Father? If it’s the Father speaking, why is Jesus worshipped by the angels (Hebrews 1:6)? Aren’t the angels obligated to obey the Ten Commandments?
Mormons would like us to believe that the Bible is corrupted, and Joseph Smith was able to restore the truth. They have to believe the Bible is corrupted, because if it weren’t, the LDS church would cease to exist. Here’s a chicken or egg question for you: Did Mormonism come about because Joseph Smith thought the Bible was corrupt, or did he teach the Bible was corrupt because he came up with Mormonism?
While there are so many misconceptions about the Trinity, it is the concept that makes sense out of the entire Bible. All of the non-Trinitarian ideas-including those of the Mormons-fall apart when viewed through a Scriptural lens.