Mormon doctrine is not Christianity.

Psalm 90 puts the Lord before the world, before the mountains, and before every creaturely life. He is God from everlasting to everlasting. He did not become God within a larger order.

Christian monotheism says what God is: eternal, uncreated, and not one member of a divine species or family into which others may later rise.

Isaiah is categorical. No God was formed before the Lord, none will be formed after Him, there is no other, and the Lord knows no other God. The Lord also made all things alone, not alongside other divine beings.

These claims do not fit a system where the Father, Son, and Holy Ghost are separate divine beings and exalted humans may become gods. Isaiah does not tell Israel to prefer one God among many real gods. He denies that any other true God exists beside, before, after, or around the Lord.

LDS sources plainly teach that Jesus is central to LDS faith, that He is confessed as Savior and Redeemer, and that He is uniquely obedient and victorious. Latter-day Saints speak reverently about Him.

What matters is whether the Jesus they confess is the eternal Word through whom, in the New Testament, all created things came to be. A shared name and sincere devotion do not settle that.

Colossians calls Christ the firstborn of all creation, and the next sentence explains the title: all things in heaven and on earth, visible and invisible, were created by Him and for Him. Thrones, dominions, rulers, and authorities are among the all things that depend on the Son.

So firstborn cannot mean the first creature in a sequence. The Son is before all things, the agent of all things, the goal of all things, and the one in whom all things hold together. The title marks His supremacy over a creation that exists through Him and for Him.

The Christian doctrine of the Trinity begins where Israel's confession begins: there is one God. Deuteronomy 6 confesses one Lord, Isaiah denies any other God before, after, beside, or unknown to the Lord, and Paul can speak of many so-called gods while still confessing one God and one Lord.

The Trinity does not leave monotheism. It answers who belongs inside the identity of the one God, and any Christian account of Father, Son, and Spirit has to stay within that limit.

John says the Word was with God, was God, and made all things. Thomas confesses the risen Jesus as Lord and God. Colossians says all things in heaven and on earth were created by Him and for Him, and Hebrews places the Son above angels with divine honor and throne language.

These texts say more than that Jesus is authorized by God or unusually close to God. They put the Son on the Creator side of the Creator-creature line. Christianity confesses the Son as true God because the New Testament gives Him divine identity, work, honor, and name.

The strongest LDS case does not rest on a minor complaint about church history. It says the New Testament itself warns of false teachers, wolves, corrupt leaders, and departure from the faith, and that after the apostles died the church lost priesthood authority, plain doctrine, ordinances, and the fulness of the gospel.

On that reading, Joseph Smith did not found one more denomination. He was called because none of the existing churches had the full apostolic authority Christ intended, and Joseph Smith-History's command to join none of them belongs to that claim.

The New Testament expects false teaching, spiritual deception, loveless churches, abusive leaders, and people who abandon the faith once delivered, and Christianity should not downplay those warnings. Church history also includes real corruption, bad theology, moral failure, and institutional abuse.

Those facts show that churches need correction, discipline, reform, and constant return to the apostolic word. They do not by themselves show that Christ's whole earthly church lost the gospel and saving priesthood authority for centuries.

Paul says a different gospel must be rejected even if an angel from heaven announces it. That bears directly on restoration claims that rest 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 on that prophet's own word.

Scripture commands believers to test spirits, examine claims, and obey God. A spiritual witness does not authenticate itself.

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

Latter-day Saints do not deny grace, Christ's atonement, repentance, or divine help. Official LDS teaching speaks directly about grace through Jesus Christ.

In LDS teaching, grace sits alongside restored priesthood authority, laws and ordinances, covenants, worthiness, temple worship, and the goal of exaltation. Grace has to be read inside that arrangement.

Ephesians 2 says salvation is by grace through faith, not from works, and then says believers are created in Christ for good works. Romans 3 and Titus 3 give the same order: God's mercy and Christ's saving work are the ground, not righteous deeds.

Obedience is not optional, but it is the fruit of new life in Christ, not a ladder into exalted godhood. The Christian dispute concerns the role of works and ordinances in salvation, not whether disciples should obey.

Historic Christians do not deny church order, pastoral ministry, baptism, the Lord's Supper, discipline, ordination, or the need for the church to act under Christ's authority. They dispute whether Christ's church lost saving priesthood authority and needed Joseph Smith to restore it.

LDS teaching says priesthood authority and keys were withdrawn after the apostles and restored in the latter days. If that is true, ordinary Christian ministry was not just disordered or incomplete. It lacked the authority needed for essential ordinances.

Hebrews treats the Aaronic and Levitical priesthood as real, biblical, and limited. It could offer sacrifices within the old covenant, but it could not bring final perfection, and its priests were many because death prevented them from continuing.

Hebrews then turns to Melchizedek language to show the superiority of Christ. Believers are not told to look for a later chain of Melchizedek office holders for saving access to God. Jesus Himself is the priest who fulfills what the former priesthood could not complete.