The Bible itself gives Christians (and any seeker) three specific tests for distinguishing a true prophet from a false one. They are not Christian inventions to evaluate Muhammad. They are commitments the Hebrew prophets, Jesus, and the apostles all share: predictions come true (Deut 18:21-22), teaching does not lead away from the God of Israel and his covenant (Deut 13:1-5), and the gospel preached agrees with the apostolic gospel (Gal 1:8; Matt 7:15-20). A Christian applies these tests to all prophetic claims — including ones internal to Christian history.
The three tests
1. Predictive accuracy — Deuteronomy 18:21-22
'And if you say in your heart, "How may we know the word that the LORD has not spoken?" — when a prophet speaks in the name of the LORD, if the word does not come to pass or come true, that is a word that the LORD has not spoken; the prophet has spoken it presumptuously.'
A prophet's claim to speak for God is testable in part by whether their predictions come true. The Hebrew prophets staked their lives on this (Jer 28).
2. Theological consistency — Deuteronomy 13:1-5
If a prophet performs signs, but his message is 'let us go after other gods, which you have not known,' the people are not to listen. Even genuine miraculous signs do not validate a teaching that breaks covenant fidelity. The test is not what the prophet can do. It is what God commits his people to remain.
3. Gospel consistency — Galatians 1:8 and Matthew 7:15-20
In the New Testament, the test sharpens. Paul writes (Gal 1:8): 'Even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed.' Jesus says (Matt 7:15-20): 'You will recognize them by their fruits.'
How a Christian applies these tests
The Christian does not say, 'these are the tests, Muhammad fails them, end of conversation.' That posture loses the conversation in the first sentence.
The Christian asks the questions one at a time, gently, and is willing to apply them to other claimants too — including charismatic prophets in Christian history.
Test 1 applied
Does the prophet make verifiable predictions, and do they come true? This is a question of historical record. A Christian and a Muslim can examine particular cases together (e.g., Q 30:2-4 on the Romans, the predictions in the sīra) without precommitment.
Test 2 applied
Does the prophet's teaching agree with what the Hebrew Scriptures and the New Testament confess about God? This is a doctrinal question about whom we worship and how we are saved. It is the heart of the disagreement between Islam and Christianity.
Test 3 applied
Does the prophet's gospel agree with the apostolic gospel? The apostles preached Christ crucified, risen, and worshiped as Lord (1 Cor 15:3-8; John 20:28). Any prophet whose message contradicts this gospel — by denying the cross, the resurrection, the deity of Christ, or salvation by grace through faith — fails the apostolic test.
Pastoral notes
This is a page where Christians regularly fall into triumphalism. Three notes.
1. The tests are not a debate trophy. They are how the church discerns its own faithfulness. Many self-styled Christian prophets in history have failed these tests too. Christian humility before these tests is the right starting point.
2. Lead with Jesus, not with Muhammad. A Christian's job is not first to disqualify Muhammad. It is first to commend Christ. The tests are useful when a Muslim friend asks, 'why don't Christians accept Muhammad as a prophet?' They are not useful as an opening salvo.
3. The deeper question is the gospel. Even a perfect predictive record would not be the gospel. The gospel is not 'a man got the future right.' The gospel is 'God himself has come in Christ to save sinners.' A Muslim friend who is interested in evidence will get there. The first job is to commend the Savior.
A note for the Christian reader
Walk these tests through with your friend slowly, asking questions, listening, and applying them honestly. Do not weaponize them. The Holy Spirit, who is the true witness to Christ (John 15:26), is the one who finally convinces.
Apply the tests to Jesus too
The Bible's tests are not partisan. Apply them to Jesus.
- Predictive accuracy. Jesus predicted his death, the manner of his death, his resurrection on the third day, the destruction of the temple within a generation, and the spread of the gospel to the nations. Each is verifiable history.
- Theological consistency. Jesus claims unity with the God of Israel, not departure from him (John 10:30; Mark 12:29).
- Gospel consistency. Jesus preached a gospel of salvation by grace through faith on the basis of his own death and resurrection (Mark 10:45; John 3:16).
A Muslim seeker who reads the Gospels and asks the same questions of Jesus that Christians ask of Muhammad is, in the end, the conversation Christians most want.
Sources to read
Click a source title to read it on an authoritative site (quran.com for the Qurʼān and tafsīr; sunnah.com for ḥadīth).
| Source | What it covers |
|---|---|
| Deuteronomy 18:15-22 | The prophet test passage. |
| Deuteronomy 18:18 | A prophet like Moses, applied to Jesus. |
How to think about it
- Apply the tests gently. They are commitments, not weapons.
- Apply them to Jesus too. Predictive accuracy, theological consistency, gospel consistency.
- Lead with the gospel. The point is not to disqualify a rival prophet; it is to commend Christ.
Common objections
- Christians do not have the right to test Muhammad.
Christians are not testing Muhammad as judges. They are honoring the tests their own scriptures put on every prophetic claim — including claims internal to Christian history. Asking 'does this teaching agree with the gospel?' is the question every Christian must ask.
- Galatians 1:8 doesn't apply to Muhammad; he came centuries after Paul.
Paul writes 'even if we or an angel from heaven should preach to you a gospel contrary' — he is naming a category, not just contemporaries. The principle is that the apostolic gospel has authority over later claims.
Related questions
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