core argument
LDS doctrine teaches a different God
LDS doctrine does not teach the one eternal God confessed by Scripture.
Scripture rules out divine plurality
Isaiah says no God was formed before the Lord and none will be formed after Him. Isaiah also says the Lord made all things alone and knows no other God. Paul can speak of many so-called gods, but Christian confession remains one God and one Lord.
That is not merely a rule about Israel's worship. It is a claim about reality: there is one God.
LDS sources teach another framework
Official LDS material describes the Father, Son, and Holy Ghost as distinct beings. Doctrine and Covenants 130 says the Father and Son have bodies of flesh and bones. Abraham 4 repeatedly says 'the Gods' organized creation.
Those are not minor vocabulary differences. They redefine the word God away from one eternal divine being and toward a plurality of divine beings unified in purpose.
One in purpose is not biblical monotheism
LDS teaching can say Father, Son, and Holy Ghost are one in purpose. Christianity can also say the persons are united in will. That shared word one does not settle the meaning.
The biblical claim is stronger than unity of purpose among divine beings. Isaiah's denial of any other God, John's statement that God is spirit, and Paul's confession of one God and one Lord leave no room for a family or council of true gods.
Exaltation completes the category shift
The difference is not only that the Father is embodied in LDS doctrine. It is also that human beings may receive exaltation, and Doctrine and Covenants 132 says the exalted shall be gods.
That creates a different doctrine of deity: God is no longer the only eternal, uncreated Creator, but the head of a divine order into which others may enter. Christianity rejects that category.
Primary references
The argument rests on public Scripture, official LDS material, and Christian sources.
Deuteronomy 6
BibleRef
Christian monotheism inherits Israel's confession, not a council of true gods.
Isaiah 43
BibleRef
This directly challenges exalted humans becoming gods in the same order.
Isaiah 44
BibleRef
This contrasts with Abraham 4's language of 'the Gods' organizing creation.
John 4
BibleRef
This presses against later teaching that the Father is embodied by nature.
Godhead, Topics and Questions
The Church of Jesus Christ of Latter-day Saints
Official LDS teaching that the Father, Son, and Holy Ghost are distinct beings, one in purpose and doctrine.
God, Godhead, Guide to the Scriptures
The Church of Jesus Christ of Latter-day Saints
LDS guide entry describing Father, Son, and Holy Ghost as three separate personages.
Doctrine and Covenants 130
The Church of Jesus Christ of Latter-day Saints
Canonical LDS text teaching that the Father and Son have bodies of flesh and bones.
Abraham 4
The Church of Jesus Christ of Latter-day Saints
Pearl of Great Price creation account repeatedly describing 'the Gods' organizing the heavens and the earth.
Becoming Like God
The Church of Jesus Christ of Latter-day Saints
Official essay explaining LDS divine potential and acknowledging that LDS teaching goes beyond most contemporary Christian churches.
Doctrine and Covenants 132
The Church of Jesus Christ of Latter-day Saints
Canonical LDS text tying exaltation to covenant sealing and saying the exalted shall be gods.