Christianity is the largest religion in the world, but not every group that claims the Christian label teaches what the Bible actually teaches. Some observers dismiss the differences with “do not judge,” while others wonder if the deviation is serious enough to dispute or even break fellowship. So how can you recognize false teaching when you see it?
What Is Heresy?
Both the Old and New Testaments distinguish sharply between truth and error. The Lord spoke through the prophet Jeremiah:
The prophets are prophesying falsehood in My name. I have neither sent them nor commanded them nor spoken to them; they are prophesying to you a false vision, divination, futility, and the deception of their own minds.
Jeremiah 14:14
The apostle Peter warned that this pattern would continue into the church age:
[F]alse prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them… And many will follow their sensuality, and because of them the way of truth will be maligned.
2 Peter 2:1-2
The apostle Paul, writing to a troubled church at Corinth, identified the specific marks of false Christian teaching:
You seem so gullible: you believe whatever anyone tells you even if he is preaching about another Jesus than the one we preach, or a different spirit than the Holy Spirit you received, or shows you a different way to be saved. You swallow it all.
2 Corinthians 11:4, LB
According to Paul, you can detect false teaching in anyone claiming to be a Christian if they hold to:
- a different Jesus
- a different spirit
- a different Gospel
- a different authority
This article examines all four marks of false doctrine in turn, beginning with a distortion of the Gospel that goes back to the first century and still persists among some groups today: the belief that the Gospel, PLUS something more, is needed to be saved.
A Different Gospel: The First Mark of False Teaching
The Christian Church began at the Jewish feast of Pentecost (Acts 2), when believers received the “baptism of the Holy Spirit” (Acts 1:5). Some early Jewish believers mistakenly assumed that salvation through Jesus the Messiah was for Judaism alone. These Pharisaic believers, known as “Judaizers,” expressed their view at the Jerusalem Council in Acts 15:5: “It is necessary to circumcise them [Gentiles], and to direct them to observe the Law of Moses.” In other words, salvation required conversion to Judaism plus observance of the Mosaic Law — the Gospel plus the Law and Jewish customs.
The Apostles’ Response to False Doctrine
The Judaizers carried this false teaching into the Gentile churches Paul had started in Galatia. Paul responded without hesitation:
I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different Gospel…[they] want to distort the Gospel of Christ. But even though we, or an angel from heaven, should preach to you a Gospel contrary to that which we have preached to you, let him be accursed.
(Galatians 1:6-8, emphasis added)
What did Paul actually preach? “For by grace you have been saved through faith, and that not of yourselves, it is the gift of God; not as a result of works, that no one should boast” (Ephesians 2:8-9, emphasis added). Grace plus anything more is not the saving Gospel. Peter agreed: “But we [Jews] believe that we are saved through the grace of the Lord Jesus, in the same way as they [Gentiles] also are” (Acts 15:11).
Sola Gratia and Sola Fide
The Reformation of the sixteenth and seventeenth centuries established five “solas” (Latin).* Two are directly relevant here: sola gratia (by grace alone) and sola fide (by faith alone) — a position Paul had already staked out in the first century:
…for all have sinned and fall short of the glory of God, being justified as a gift by His grace through the redemption which is in Christ Jesus… For we maintain that a person is justified by faith apart from works of the Law.
Romans 3:23-24, 28
Contemporary Groups That Deviate from Grace and Faith Alone
Several groups that call themselves Christian affirm solus Christus (Christ alone) in name, yet still oppose the Reformation teaching of salvation by grace and faith alone — a clear example of false doctrine hiding behind familiar vocabulary:
- Mormonism – salvation results from obedience to the teachings of the Mormon Church, baptism, and good works (Grace PLUS)
- Jehovah’s Witnesses – salvation is a reward for faithfulness (Grace PLUS)
- Christian Science – sin, sickness, and death are illusions, so no redemption is needed; man as God’s idea is already saved (Grace denied)
- Catholicism – outside the Roman Church there is no salvation; baptism is a required sacrament (Grace PLUS)
- Eastern Orthodoxy – salvation comes only through the one Church, and God judges each person by how well they lived (Grace PLUS)
The Foundation of Assurance
If salvation depends on anything added to grace through faith, assurance becomes impossible. The nagging question of “have I done enough?” follows a person to the deathbed, reduced to little more than “I hope, I hope…” But Scripture teaches that salvation is not about performance or man-made requirements (Mark 7:7). Paul stated the assurance plainly:
I am not ashamed of the Gospel, because it is the power of God for the salvation of everyone who believes… For in the Gospel a righteousness from God is revealed, a righteousness that is by faith from first to last…”
Romans 1:16-17, NIV
The apostle John tied this assurance to another Reformation sola, solus Christus: “For God so loved the world, that He gave His only begotten Son, that whoever believes in Him should not perish, but have eternal life” (John 3:16). A distorted Gospel is only the first mark of false teaching — the next test is whether a group preaches the true Jesus of Scripture.
A Different Jesus: The Second Mark of False Teaching
Having identified a distorted Gospel as one form of false doctrine, Paul’s test in 2 Corinthians 11:4 also points to a counterfeit Jesus as a second warning sign — one that distinguishes genuine Christian groups from those often labeled “cults.”
The Genuine: An Important Unity
The three major divisions within Christianity agree on the essential nature of Jesus, the object of Christian faith:
We believe there is one God, eternally existent in three persons: Father, Son, and Holy Ghost. We believe in the deity and humanity of Christ, in His virgin birth, in His sinless life, in His miracles, in His vicarious and atoning death through His shed blood, in His bodily resurrection, in His ascension to the right hand of the Father, in His present rule as Head of the Church, and in His personal return in power and glory.
This description is consistent with all major creeds of the Christian faith, including the Apostles’ Creed, the Nicene Creed, and the Athanasian Creed. Paul affirmed this foundation to the Corinthian church:
By the grace God has given me, I laid a foundation… For no one can lay a foundation other than the one already laid, which is Jesus Christ
1 Corinthians 3:10-11
On this point, Protestants, Catholics, and Orthodox believers stand united.
The Counterfeit: A Different Jesus
The Gnostics proclaimed a counterfeit Jesus as early as the first and second centuries, challenging the incarnation — “And the Word [God] became flesh” (John 1:14) — by claiming the man Jesus differed from the spirit Christ, and that only the spirit was resurrected. The apostle John, confronting this false teaching near the end of the first century, answered directly: “Who is the liar but the one who denies that Jesus is the Christ?” (1 John 2:22), adding that “Jesus Christ has come in the flesh” and “Jesus is the Son of God” (1 John 4:2, 15).
This same false teaching persists today in different forms. Jehovah’s Witnesses teach that “the man Jesus is forever dead but only an invisible spirit Son was resurrected.” Christian Science similarly claims, “The spiritual Christ was infallible; Jesus, as material manhood, was not Christ.” Millions who identify as Christians unknowingly follow this false teaching.
Mormonism presents yet another distorted Jesus — not eternal, but “a spirit-being conceived of physical mother and father gods in the preexistence,” and not one person of the Trinity but “a normal man who progressed to godhood.”
Scripture stands in stark contrast: “Jesus Christ is the same yesterday, and today, yes and forever” (Hebrews 13:8). Paul wrote that “in Him [Jesus] all the fulness of Deity dwells in bodily form” (Colossians 2:9). Jehovah’s Witnesses likewise deny that Jesus is eternal, teaching instead that he was created by Jehovah and is not one person of a Trinitarian God. Both Mormons and Jehovah’s Witnesses use the name “Jesus,” but their description of him does not match the Jesus of the Bible and therefore cannot save anyone from sin and death. With these groups, definitions matter — they use biblical words but assign them entirely different meanings.
Solus Christus (Christ Alone)
Just as some groups depart from salvation by grace alone through faith alone, Mormons and Jehovah’s Witnesses depart even further by rejecting Christ alone as defined in Scripture. Paul minced no words about the stakes: “By the grace God has given me, I laid a foundation… For no one can lay a foundation other than the one already laid, which is Jesus Christ.” Hymn writer Robert Lowry captured why getting this right matters so much:
What can wash away my stain? / Nothing but the blood of Jesus; / What can make me whole again? / Nothing but the blood of Jesus. / O! precious is the flow / That makes me white as snow; / No other fount I know, / Nothing but the blood of Jesus.
“Nothing but the Blood of Jesus,” by Robert Lowry, 1876 (public domain).
A false Gospel and a false Jesus are two marks of false doctrine — but Paul’s test also warns of a third and fourth: a different spirit and a different authority.
A Different Spirit and a Different Authority: The Final Marks of False Teaching
At His trial, Jesus told Pontius Pilate that He had “come into the world to bear witness to the truth.” Pilate cynically replied, “What is truth?” (John 18:37-38). That question frames the third and then final test for detecting false Christian teaching: what authority governs Christian faith and practice, and whose spirit is actually at work?
Having already examined the Gospel of salvation (sola gratia through sola fide) and the true nature of Jesus (solus Christus), the remaining question is how various “Christian” groups measure up to the Reformers’ position that final authority belongs to Scripture alone (sola scriptura) — and whether some of these groups, as Paul warned, operate under “a different spirit” (2 Corinthians 11:4).
The New Testament Canon Closed
Which New Testament books qualify as inspired, forming the standard — the canon — for Christian faith and practice? R. Laird Harris argues persuasively that the test of inspiration is apostolicity: authorship by an eyewitness apostle or someone commissioned by the apostles (2 Peter 1:20-21; 3:2; 2 Timothy 3:16). On this basis, the New Testament canon was limited to twenty-seven books written in the first century by apostolic eyewitnesses. Without further apostolic authority after that century, the New Testament canon was closed.
Or Was It?
Many groups calling themselves “Christian” add other writings they treat as equally authoritative, or claim ongoing new revelation from God, or both — treating the canon as incomplete rather than closed. This is one of the clearest patterns of false doctrine in groups outside historic Christianity:
- Mormonism – The Book of Mormon, Doctrine and Covenants, and the Pearl of Great Price are treated as final truth alongside the Bible; the church president is regarded as a “prophet, seer, and revelator” receiving new revelation.
- Jehovah’s Witnesses – The Bible is considered fallible and has been corrected, rewritten, and republished by the Watchtower Society, whose revised version alone is authoritative; the Society itself is viewed as God’s channel for ongoing revelation.
- Catholicism and Eastern Orthodoxy – Church leadership is believed capable of receiving additional revelation, producing doctrines like Mary’s sinlessness, her role as intercessor, purgatory, and the intercessory role of saints — none found in Scripture, yet treated as equally authoritative.
The Bible’s Answer
On new revelation:
You shall not add to the word I am commanding you… Whatever I command you, you shall be careful to do; you shall not add to nor take away from it.
Deuteronomy 4:2; 12:32
I testify to everyone who hears the words of the prophecy of this book: if anyone adds to them, God shall add to him the plagues which are written in this book…
Revelation 22:18
On the sinlessness of Mary — Scripture teaches none are sinless but Christ alone (2 Corinthians 5:21):
…for all have sinned and fall short of the glory of God…
Romans 3:23
If we say we have no sin, we are deceiving ourselves…
1 John 1:8
On saints and Mary as mediators — Scripture identifies only two:
For there is one God, and one Mediator also between God and men, the man Christ Jesus…
1 Timothy 2:5
…the Spirit helps our weakness; for we do not know how to pray as we should, but the Spirit Himself intercedes for us with groanings too deep for words…
Romans 8:26-27
A Different Spirit
This same pattern of false teaching extends to the Holy Spirit. Mormons and Jehovah’s Witnesses deny the Trinity, treating the Spirit not as a person of the Godhead but as “the active invisible force of Almighty God” (Jehovah’s Witnesses) or “a separate personage, one of a pantheon of gods” (Mormonism) — precisely the “different spirit” Paul warned against (2 Corinthians 11:4). Protestants, Catholics, and Orthodox believers, by contrast, hold in common that God is one, eternally existing in three persons: Father, Son, and Holy Spirit (Matthew 28:19; John 16:12-15; 1 Corinthians 2:10-11).
Truth: The Standard for Detecting False Teaching
This article began with Pilate’s question about truth. Jesus answered it Himself the night before His crucifixion: “Sanctify them in the truth; Your word is truth” (John 17:17, emphasis added). May every reader affirm the Psalmist’s testimony: “Thy word is a lamp to my feet, and a light to my path” (Psalm 119:105).
Whenever a teaching presents a different Gospel, a different Jesus, a different spirit, or a different authority, it fails the biblical test — regardless of how “Christian” it sounds. Use the benediction of Jude 24-25 to commit your life to the one true Savior, Jesus Christ, and to remain faithful to His truth:
Now to Him who is able to keep you from stumbling, and to make you stand in the presence of His glory blameless with great joy, to the only God and Savior, through Jesus Christ our Lord, be glory, majesty, dominion and authority, before all time and now and forever. Amen.
*The five solas of the Protestant Reformation, which distinguished the Reformers from the teachings of Rome and the political and spiritual authority of the papacy, are: sola scriptura (Scripture alone), solus Christus (Christ alone), sola fide (faith alone), sola gratia (grace alone), and soli Deo gloria (glory to God alone).
Sources: The Kingdom of the Cults, Walter Martin, Bethany House Publishers, 1985; Inspiration and Canonicity of the Bible, R. Laird Harris, Zondervan.
