Mormons may "believe" in alot of things. I won't debate what a person "believes" since, as I've learned in discussions with many Mormons, it all falls back to their "interpretations" and burning bosoms instead of being like a Berean and searching the Bible for the answers.
However...what Mormonism "teaches" is entirely up for debate and that will be the position I take. Let's start with some basics...
The Bible:
Jesus answered, “The foremost [commandment] is, 'HEAR, O ISRAEL! THE LORD OUR GOD IS ONE LORD;” (Mark 12:29)
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Mormonism:
“the Council of the Eternal God of all other gods before this world was” (D&C 121:32)
The Gods plan the creation of the earth and all life thereon” (PoGP:Abraham 4:Heading)
“And they went down at the beginning, and they, that is the Gods, organized and formed the heavens and the earth.” (PoGP:Abraham 4:1)
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The Bible:
“God is spirit, and those who worship Him must worship in spirit and truth.” (John 4:24)
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Mormonism
“The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us.” (D&C 130:22)
This is the way our Heavenly Father became God. Joseph Smith taught: 'It is the first principle of the Gospel to know for a certainty the character of God. . . . He was once a man like us; . . . God himself, the Father of us all, dwelt on an earth... (Teachings of the Prophet Joseph Smith, pp. 345-46).”8
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The Bible:
In the beginning was the Word, and the Word was with God, and the Word was God. He was with God in the beginning. Through him all things were made; without him nothing was made that has been made. (John 1:1-3)
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Mormonism
“Every person who was ever born on earth was our spirit brother or sister in heaven. The first spirit born to our heavenly parents was Jesus Christ (see D&C 93:21), so he is literally our elder brother (see Discourses of Brigham Young, p. 26).”
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The Bible:
“You are My witnesses,” declares the LORD, “And My servant whom I have chosen, In order that you may know and believe Me, And understand that I am He. Before Me there was no God formed, And there will be none after Me.” (Isaiah 43:10)
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Mormonism
“If we prove faithful to the Lord, we will live in the highest degree of the celestial kingdom of heaven. We will become exalted, just like our Heavenly Father. Exaltation is the greatest gift that Heavenly Father can give his children (see D&C 14:7).”
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The Bible
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment: >>>>
Mormonism (JS himself)
"...and every man who has a friend in the eternal world can save him..." Joseph Smith, King Follet's discourse.
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Discuss the issues all you want, but do not make it personal.