Mormon doctrine is not historic Christianity.

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.

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.

John says the Word was God and that all things were made through Him. Colossians says all things were created by and for Christ, and that He is before all things. Hebrews separates the Son from angels and gives Him divine honor.

This is why Nicene Christianity says the Son is begotten, not made. He is not one being inside the created order.

Official LDS sources teach a premortal world of Heavenly Parents and spirit children, with Jesus as Firstborn spirit Son and Savior. They also identify Satan as a spirit son who rebelled.

The precise point is not a shock line about Jesus and Lucifer. The point is that LDS doctrine places Christ inside a category that the New Testament excludes.

Scripture teaches one God. It identifies the Son as God and Creator. It treats the Spirit as divine. It also distinguishes Father, Son, and Spirit personally. The Trinity is a doctrinal synthesis of those claims, not a denial of any one of them.

Matthew 3 does not disprove the Trinity by distinguishing Father, Son, and Spirit. It disproves modalism. Trinitarian Christianity already teaches real personal distinction.

LDS sources reject post-New Testament creeds and define the Godhead as distinct beings united in purpose. That is a direct rejection of one divine being in three persons.

So the disagreement is not whether fourth-century Christians used technical terms. It is whether the terms faithfully guard the biblical data.

Official LDS sources say priesthood authority was withdrawn after the apostles and that the fullness of the gospel was restored through Joseph Smith. Joseph Smith-History says he was told to join none of the existing churches.

That is not ordinary denominational disagreement. It is a claim that the visible historic church lacked essential authority.

Matthew 16 says the gates of hell will not prevail against Christ's church. Matthew 28 promises Christ's presence with His disciple-making mission to the end of the world.

The New Testament warns about false teachers, but warnings about apostasy do not prove a total loss of Christ's church and priesthood from the earth.

Paul says a different gospel must be rejected even if an angel from heaven announces it. That rule is directly relevant to restoration claims that depend on angelic ministry and new scripture.

A later prophet cannot change the doctrine of God, Christ, church, and salvation and then ask to be accepted because the later prophet says so.

Scripture commands believers to test spirits, examine claims, and obey God. A spiritual witness is not self-authenticating.

If a testimony leads away from the apostolic doctrine of one God and the eternal Son, the testimony has failed the biblical test.

Ephesians 2 says salvation is by grace through faith and that good works follow as the fruit of God's workmanship. Titus 3 says salvation is by mercy, not righteous deeds.

Obedience belongs to Christian life, but obedience is not an exaltation ladder to godhood.

The Articles of Faith speak of laws and ordinances. Doctrine and Covenants 132 ties exaltation to covenant sealing and says the exalted shall be gods.

That is not merely the biblical command to obey Christ. It is a restored priesthood, temple, sealing, and godhood system.