Who Was Muhammad? Galatians 1:6-9 and the Only Gospel
Short answer: Muhammad was a seventh-century Arabian religious teacher whose movement became Islam, and whose message denies that Jesus is the eternal Son of God who died and rose again. Scripture does not leave us guessing about how to weigh a later prophet. Galatians 1:6-9 says, "I marvel that you are so quickly deserting him who called you in the grace of Christ to a different 'good news'" and pronounces a curse on anyone, angel or man, who preaches another gospel. Christians therefore assess Muhammad's claims by the apostolic gospel, not the reverse. This does not license rudeness toward Muslims. It does mean honesty: the New Testament will not let us call another gospel a variety of the same faith.
The setting of Galatians: a church already drifting
Paul writes to churches he had planted in the Roman province of Galatia, likely in the late 40s or early 50s. The trouble was not persecution from outside but teaching from inside. Certain men had come insisting that Gentile believers must be circumcised and keep the law of Moses to be right with God. Paul does not treat this as an interesting option for a different culture. His opening line in Galatians 1:6-9 registers shock. The word rendered marvel is not polite surprise; it is the astonishment of a man watching people he loves walk away from the one who called them.
The phrase to notice is that he says they are deserting him who called you. In other words, a shift in teaching about how a person is saved is not a shift in emphasis. It is a departure from the person of God himself, who called them in the grace of Christ. The Galatian error did not say Jesus was unimportant. It added a requirement. Paul's response shows that adding to the gospel is not a minor adjustment; the offense lies in the addition itself, because grace plus anything is no longer grace.
That is why this passage applies so directly to any later claim of revelation. The question is not whether a teacher speaks warmly of Jesus. The question is whether the message preserves the Christ of the apostles and the way of salvation he accomplished. Paul's concern is not a style of worship, a language, or a cultural preference. It is the content of the good news itself. A different message about how sinners are made right with God is precisely what he calls a different good news, and the quotation marks in the text signal that he does not accept the label.
Notice also the speed. Paul is amazed that they are turning so quickly. False teaching rarely announces itself as a departure. It usually arrives as an improvement, a completion, a needed correction, or a new chapter in God's dealings. The danger is rarely a sudden rejection of everything. More often it is a gradual redefinition of terms while keeping the vocabulary. Because of that, the church must constantly do what the Galatians failed to do: compare the message to the apostolic foundation and ask whether the same gospel is still being preached.
What Paul means by another gospel
Paul's expression in Galatians 1:6-9 is not vague. He is not warning against bad manners, poor sermons, or unfamiliar styles of worship. A different gospel, in his usage, is a message that changes the ground of a sinner's acceptance before God. If the message says Christ's work is sufficient but then adds a further requirement for justification, it has altered the foundation. If it removes the cross as the payment for sin, it has done the same. The issue is the object of faith and the basis of forgiveness.
This is why Paul can be so severe in the same breath as his astonishment. He does not say such teachers are merely mistaken and should be given time. He says that even if an angel from heaven preached a different message, that messenger stands accursed. The point is not that Paul has a personal preference he wants protected. The point is that the gospel is a message given by God, not a product the church may revise. A message that reverses it is not an update; it is a different thing wearing the same clothes.
Understanding this helps us read the rest of the New Testament's warnings without embarrassment. John tells believers to test the spirits, and he supplies a concrete test: whether a confession acknowledges that Jesus Christ came in the flesh. A teaching can use high language about God and still fail the test at the point of who Jesus actually is. Paul and John are not asking for suspicion of everything; they are asking for discernment, which assumes there is a standard by which to discern.
It also guards against a common misuse of Paul's words. Some readers take the curse language as permission to be harsh, dismissive, or cruel to people who hold a different faith. But Paul's concern is the message, not the mistreatment of persons. He himself was willing to become all things to all people for the sake of the gospel, and he grieved over his own people rather than despising them. Fidelity to the gospel and kindness toward those who disagree are not in tension; in the New Testament they belong together, precisely because the truth matters and so do people.
Who Muhammad claimed to be
Muhammad lived in the late sixth and early seventh centuries in the Arabian Peninsula, born around 570 in Mecca and dying in 632 in Medina. According to Islamic sources, he received recitations beginning in his early forties, which were collected as the Qur'an and regarded by Muslims as the final and uncorrupted revelation from God. He is understood by Muslims as the last prophet in a line that includes Adam, Noah, Abraham, Moses, and Jesus. Islam means submission, and a Muslim is one who submits to God.
Many of the ethical teachings associated with Muhammad overlap with values Christians share: care for the poor, honesty in trade, prayer, fasting, and reverence for God. Muslims honour Jesus as a prophet and Mary as a pure woman, and Islam holds a high view of God's unity and majesty. Christians should not caricature these convictions or pretend they are trivial. Where Muhammad's message agrees with Scripture, we can acknowledge it gladly, and where our Muslim neighbours show devotion, patience, and charity, we can honour it without pretending the disagreements are not there.
The central disagreement, however, is not minor and cannot be smoothed over with polite phrasing. Islam denies that Jesus is the divine Son and denies that he was crucified and raised. The Qur'an presents Jesus as a prophet and messenger, not as God in the flesh, and it does not teach his atoning death and resurrection as the means of salvation. That is not a small variation on the apostolic message. It removes the very events on which the gospel rests, which is why Paul's warning about another gospel bears directly on how the church evaluates Islam's claims.
Christians should also be careful about how they describe Muhammad. It is one thing to summarise Islamic teaching accurately and test it by Scripture. It is another to make sweeping, hostile claims about his personal character that go beyond what we can responsibly assert. The New Testament pattern is to name the doctrinal issue plainly and to speak about persons with restraint. Our confidence rests in the gospel, not in insults. The message is judged by the apostles; the man is left in the hands of the God who alone knows the heart.
Testing a prophet by Scripture
Deuteronomy 18:20-22 gives Israel a standard for prophets: a prophet who speaks in the name of other gods, or whose prediction fails, is not to be feared. The point is that God's people are not asked to accept every claim of revelation. They are given criteria for testing it. A later prophet does not get to overturn what God has already established. That principle runs through Scripture and reaches its fullest expression in the New Testament, where the apostolic witness to Christ is the foundation on which the church stands.
Scripture also warns about false prophets who come in God's name, which means the church cannot assume that a religious claim is safe simply because it uses sacred language. Jesus himself warned about those who would come saying they are sent from God, and the apostles repeatedly told believers to examine what they hear. This is not cynicism. It is the same instinct a household has when someone claims to speak for the head of the family and the message contradicts what he has already said.
Applying this to Muhammad is straightforward, even if it is uncomfortable for some. If the apostolic gospel is true, then a later message that denies the Son's identity and the cross cannot be the same revelation from the same God, because God does not contradict himself. It may contain true elements, and it may call people to serious devotion, but it cannot be the final word that supersedes the apostles. The New Testament will not permit us to say that Muhammad and the apostles are preaching the same good news with different words.
This does not mean that everything outside the Bible is worthless or that we cannot learn from other traditions. It means that the Bible is the measure by which a prophet's claim stands or falls. Christians believe this about every teacher, including their own favourite pastors. The moment we exempt a figure from that test, we have already begun to drift in the same way the Galatians did, and Paul's astonishment is aimed at exactly that kind of drift, whether it arrives in the first century or the twenty-first.
Why the apostles leave no middle ground
The New Testament's exclusivity is not a hard edge added by later Christians. It comes from Jesus himself. In John 14:6 he says, "I am the way, the truth, and the life. No one comes to the Father, except through me." Peter declares in Acts 4:12, "There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved!" These are not the words of narrow disciples who failed to grasp a broader vision. They are the apostolic deposit, and the whole church was built on it.
John presses the same test in his letters. In 1 John 4:1-3 he writes, "Beloved, don't believe every spirit, but test the spirits, whether they are of God, because many false prophets have gone out into the world." The test he gives is christological. A spirit that refuses to confess Jesus as come in the flesh is not from God. In 2 John 1:7-11 he goes further: many deceivers have gone out into the world who do not confess that Jesus Christ came in the flesh, and he calls this the deceiver and the Antichrist. That is strong language, and it is meant to protect the flock, not to flatter the age.
Put together, these passages mean there is no middle ground where Jesus is honoured as one prophet among several and the cross is set aside. The gospel is a particular announcement about a particular person and a particular event. If that announcement is denied, then whatever else is true about the message, it is not the apostolic faith. This is why Christians cannot say that Islam and Christianity simply describe the same God in different ways. They may use overlapping words, but the content that makes the good news good is different.
At the same time, the apostolic writers' firmness is not an excuse for contempt. Paul was willing to be all things to all people, and he wept over those who rejected the message. The exclusivity of the gospel and genuine love for people belong together. We can hold firmly that there is one name given among men while treating those who disagree with respect, patience, and a clear conscience. Anything less misrepresents the very Christ whose uniqueness we are trying to uphold.
How this shapes our posture toward Muslims
Knowing who Muhammad was and what Islam teaches should make Christians more careful and more compassionate, not less. Careful, because we cannot affirm what Scripture denies; the New Testament simply does not allow us to say that a message which removes the Son and the cross is another valid path to God. Compassionate, because Muslims are not abstractions or enemies to be scored against. They are neighbours made in God's image, and many of them are sincerely devoted to God according to the light they have received.
This means our conversations should be honest and unhurried. We can ask questions and listen, and we can explain what the gospel actually claims: that God sent his Son, that the Son died for sins, and that he rose again. We can speak of sin and grace without pretending the differences are minor, because acting as if everything is basically the same is not kindness; it is a failure to share the one thing that can actually help. False reassurance values the comfort of the moment above the good of the person.
It also means we should avoid two errors that are common in Christian discussion of Islam. One is hostility that treats Muslims as a category to be feared and caricatured. The other is a vague inclusivism that treats the differences as a matter of taste. Paul's example in Galatians points to a third way: grief over error, clarity about the gospel, and refusal to revise the message even under pressure. We can say plainly that we believe Jesus is the only way and still speak with gentleness and respect.
Finally, this topic should push us back to the gospel ourselves. The Galatians were drifting, and Paul did not assume they were beyond recovery. If we find that our own confidence has quietly shifted to something other than Christ's finished work, whether tradition, experience, or personal goodness, the remedy is the same as it was for them. Return to the grace of the one who called you. The test of every prophet, including ourselves, is whether we are still resting on the Christ the apostles proclaimed.
Biblical fidelity check
Several things should be said plainly. The passages cited establish that there is one gospel, that the apostles' message about Jesus is the standard, and that false prophets are to be tested rather than welcomed automatically. They do not tell us everything about Muhammad's life, his sincerity, or his eternal state, and they give us no warrant to make claims about him beyond what the historical record and Islamic sources actually say. The text also does not command hostility, mockery, or violence toward Muslims. It commands discernment about teaching and love toward people.
A common misreading treats Paul's curse in Galatians 1:6-9 as a warrant for Christians to speak and act abusively toward those who disagree. That is wrong on its face, because the same Paul who pronounced the curse also described his grief over unbelieving Israel and his willingness to become all things to all people. The curse is directed at the message, not a license to mistreat persons. A second misreading goes the other way and treats the differences as cultural packaging for the same faith. That is also wrong, because the New Testament ties salvation itself to the identity and work of Christ, and it will not allow the cross to be quietly removed while the name is kept.
Other passages that speak to Galatians 1:6-9
Paul's warning about another gospel stands in a wider biblical context, and several related studies help fill it out. What Does 1 John 1:1 Mean? Context, Theology, and Application examines the apostolic claim to have seen and touched the Word of life. What Does 1 John 1:8 Mean? Context, Theology, and Application addresses the denial of sin that false teaching so often encourages. 1 John 1:9 Meaning: Confession, Forgiveness, and Cleansing sets out the remedy God gives to sinners, and What Does 1 John 2:15 Mean? Context, Theology, and Application warns about love of the world, a pressure that often works alongside doctrinal drift. Read together, these passages show that testing teaching and treasuring Christ are one and the same duty.
Frequently asked questions
Who was Muhammad, and why do Christians discuss him at all?
Muhammad was a seventh-century Arabian prophet whose recitations became the Qur'an and whose movement became Islam. Christians discuss him because his message makes claims about God, Jesus, and salvation, and Christians are required by passages like 1 John 4:1-3 to test such claims. Since Islam denies that Jesus is the divine Son and denies his crucifixion and resurrection, the message cannot simply be folded into the apostolic gospel. Discussing him honestly is part of loving truth and loving neighbours, not an attack on any person.
Does Galatians 1:6-9 mean every non-Christian religion is equally false?
Galatians 1:6-9 addresses any message that changes the basis of salvation. Paul's concern is a different good news that adds to or subtracts from what God has done in Christ. The passage does not offer a detailed judgment on each religion's history or ethical teaching, and faithful Christians may differ about how much common ground to acknowledge. What the text does establish is that the apostolic gospel is the standard, and that any message contradicting it cannot be accepted as an alternative form of the same faith.
Can a Christian and a Muslim worship the same God together?
Christians and Muslims can live side by side, work together, and treat each other with respect, and in many settings they do. But the question of shared worship is different. The New Testament identifies God by reference to the Father of Jesus Christ and to the Son who reveals him, and it ties salvation to the Son's person and work. Because Islam rejects the Son's identity and the cross, Christians cannot treat the two confessions as the same worship simply expressed in different words. We can be honest about that difference and still be kind, patient, and respectful.
