Question

How do Christians know that Christianity is the true religion?

Studied by claude-opus-5-5 · asked once

Start the discussion

The New Testament doesn't offer a philosophical proof. It rests its case on eyewitness testimony that Jesus rose from the dead, says plainly that the faith is worthless if that didn't happen, and adds the claim that God's Spirit confirms it inwardly. Christians disagree about how much weight to give public evidence compared with that inner witness.

What the text says

The New Testament stakes everything on one event. Paul doesn't argue that Christianity is true because it feels right or works well. He points to a public claim: Christ "was raised on the third day" and "appeared to Cephas and then to the Twelve. After that, He appeared to more than five hundred brothers at once, most of whom are still living" (1 Corinthians 15:4-6). Then he says what follows if he is wrong: "if Christ has not been raised, your faith is futile" (1 Corinthians 15:17), and Christians "are to be pitied more than all men" (1 Corinthians 15:19). That is unusual for a religious text. It names the one thing that would prove the faith false.

It appeals to testimony and to checking. Luke says he "carefully investigated everything from the beginning" using material from "eyewitnesses" so that his reader "may know the certainty" of what he had been taught (Luke 1:1-4). Jesus showed himself alive "with many convincing proofs" (Acts 1:3). John says of the crucifixion, "his testimony is true... so that you also may believe" (John 19:35). He also says his Gospel was written "so that you may believe that Jesus is the Christ" (John 20:31). Peter says, "we were eyewitnesses of His majesty," not followers of "cleverly devised fables" (2 Peter 1:16). Paul tells a king that "this was not done in a corner" (Acts 26:26). He tells Athens that God has given "proof to everyone by raising Him from the dead" (Acts 17:31). Readers are praised for checking claims against scripture (Acts 17:11) and told to "test all things" (1 Thessalonians 5:21). The Hebrew Bible already gives a test for a prophet: does what he says come true? (Deuteronomy 18:21-22).

It also claims an inner witness. Alongside the public evidence, the New Testament says believers know God personally and not only as an argument. "We know that the Son of God has come and has given us understanding, so that we may know Him who is true" (1 John 5:20). "The Spirit Himself testifies with our spirit that we are God's children" (Romans 8:16). Jesus says the person who is willing to do God's will "will know whether My teaching is from God" (John 7:17).

It is exclusive, and it is humble about what believers know. The texts claim Jesus as the only way to the Father (John 14:6; Acts 4:12). They also warn that "the one who thinks he knows something does not yet know as he ought" (1 Corinthians 8:2), and that now "we see but a dim reflection" (1 Corinthians 13:12). Believers are told to give a reasoned answer for their hope "with gentleness and respect" (1 Peter 3:15). They are not told to win arguments by force.

What a sceptic should know. These are claims made inside the texts. The Bible can tell you what its writers said they saw and why they believed. It can't, on its own terms, settle whether their testimony is reliable. That is a historical and personal question each reader has to weigh. The texts themselves invite that weighing.

Where readers differ

Evidence first: the resurrection can be examined historically

The apostles preached a public, checkable event. They named living witnesses and offered it as proof. So Christians should present historical evidence (the empty tomb, the appearances, the change in the disciples) and let people weigh it as they would any other testimony.

1 Corinthians 15:3Luke 1:1Acts 1:3Acts 17:31Acts 26:262 Peter 1:16

Scripture is self-attesting and confirmed by the Spirit

No neutral ground exists from which a fallen mind can judge God. Human reason can't certify God's word; the Spirit opens a person's eyes to see that it is true. Arguments still have a place, but certainty comes from God's own witness, not from human proofs.

1 Corinthians 2:14John 10:271 John 5:9Romans 8:161 Thessalonians 1:5

Several lines of evidence together: creation, conscience, prophecy and Christ

Creation shows that a creator exists. Conscience shows a moral law. Fulfilled prophecy and Jesus' life point to him in particular. No single argument decides it; together they make Christianity the best explanation.

Romans 1:19Psalm 19:1Romans 2:14Isaiah 41:21Luke 24:25

Known by trusting and following, not by detached analysis

Biblical knowing (yada, ginōskō) is relational. You know God the way you know a person, by trusting and obeying. The test Jesus offers is to do God's will and find out, and the proof shows in a changed life and love.

John 7:17John 17:31 John 4:7Psalm 34:8John 13:35

The words it turns on

  • πίστις πίστις (pistis)

    Trust, faithfulness, firm conviction. It can also mean a pledge or proof; in Acts 17:31 it is translated 'proof' or 'assurance'.

    Drift: In modern English, 'faith' often means believing without evidence or against it. Pistis meant trusting someone because you had reason to think they were reliable, and it could even mean the grounds for that trust.

  • ἀληθινός ἀληθινός (alēthinos)

    True in the sense of genuine or real, as opposed to counterfeit or a shadow. It is used in 1 John 5:20: 'Him who is true'.

    Drift: English 'true' usually describes a statement that matches the facts. Alēthinos describes the real thing over the imitation, so 'the true God' means the real God, not just a correct idea about him.

  • γινώσκω γινώσκω (ginōskō)

    To know, perceive or recognise, often through experience and relationship. It is used in John 8:55, John 17:3 and 1 John 5:20.

    Drift: English 'know' often suggests holding information. In the New Testament (and the Hebrew yada, H3045, behind it), knowing God means being in relationship with him, not only agreeing with facts about him.

  • τεκμήριον τεκμήριον (tekmērion)

    A sure sign or decisive proof; it was a technical term in Greek rhetoric and logic. It is used in Acts 1:3, 'many convincing proofs'.

  • θρησκεία θρησκεία (thrēskeia)

    Religious practice or worship, the outward ways a person serves God. It is used in Acts 26:5 and James 1:26-27.

    Drift: Modern 'religion' usually means one belief system among many in the world ('the true religion'). The New Testament word means a way of worship. James judges it by how people behave, not by which label they wear.

  • δεισιδαιμονία δεισιδαιμονία (deisidaimonia)

    Reverence for the gods. It can be neutral ('religion') or slightly mocking ('superstition'). Festus uses it in Acts 25:19 for the Jewish faith.

  • ἀπολογία ἀπολογία (apologia)

    A reasoned defence, as in a courtroom. It is used in 1 Peter 3:15, 'be ready to give a defence'.

    Drift: It does not mean apologising. It is the root of 'apologetics', the reasoned defence of the faith.

What the Bible doesn't say

The Bible doesn't contain a step-by-step proof that would compel any reasonable person to agree, and it doesn't compare Christianity with the world's religions one by one. The word "Christianity" itself first appears in early writers such as Ignatius (Magnesians 10), not in the New Testament. Jewish readers share the same Hebrew scriptures and the same idea of testing prophecy (Deuteronomy 18). They read those texts differently and don't accept that Jesus fulfilled them, so the appeal to prophecy is itself a point of real disagreement. Christian traditions also differ on how far human reason can get on its own: some stress argument, some revelation, some the church's witness.

Key verses

  1. 1 Corinthians 15:14

    And if Christ has not been raised, our preaching is worthless, and so is your faith.

    Paul says that if the resurrection did not happen, the faith is futile.

  2. 1 Corinthians 15:3

    For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,

    The earliest list of resurrection witnesses, including more than 500 people, most still alive when Paul wrote.

  3. Luke 1:1

    Many have undertaken to compose an account of the things that have been fulfilled among us,

    Luke describes careful investigation of eyewitness sources so that readers may know 'the certainty'.

  4. Acts 1:3

    After His suffering, He presented Himself to them with many convincing proofs that He was alive. He appeared to them over a span of forty days and spoke about the kingdom of God.

    Jesus showed himself alive 'with many convincing proofs' (tekmēria).

  5. Acts 17:31

    For He has set a day when He will judge the world with justice by the Man He has appointed. He has given proof of this to everyone by raising Him from the dead.”

    The resurrection is presented as proof (pistis) offered to everyone.

  6. John 20:30

    Jesus performed many other signs in the presence of His disciples, which are not written in this book.

    John wrote down signs as evidence so that readers may believe.

  7. 1 John 5:20

    And we know that the Son of God has come and has given us understanding, so that we may know Him who is true; and we are in Him who is true—in His Son Jesus Christ. He is the true God and eternal life.

    Knowing the 'true' (genuine) God comes through the Son, who gives understanding.

  8. Romans 8:16

    The Spirit Himself testifies with our spirit that we are God’s children.

    The claim that God's Spirit inwardly confirms the truth to believers.

  9. 1 Peter 3:15

    But in your hearts sanctify Christ as Lord. Always be prepared to give a defense to everyone who asks you the reason for the hope that is in you. But respond with gentleness and respect,

    Believers are to give a reasoned defence of their hope, with gentleness and respect.

  10. John 14:6

    Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through Me.

    Jesus' claim to be the only way to the Father makes the question of truth unavoidable.

  11. Deuteronomy 18:21

    You may ask in your heart, “How can we recognize a message that the LORD has not spoken?”

    The Hebrew Bible's own test for a genuine message from God: does it come true?

  12. Acts 26:26

    For the king knows about these matters, and I can speak freely to him. I am confident that none of this has escaped his notice, because it was not done in a corner.

    The events were public and open to checking: 'not done in a corner'.

Common points of confusion
Biblical faith means believing without any evidence.
The New Testament repeatedly offers evidence for belief: eyewitnesses, 'convincing proofs' and written signs (Luke 1:1-4; Acts 1:3; John 20:31). Pistis means trust grounded in reasons.
Jesus' words 'blessed are those who have not seen' (John 20:29) put down evidence.
The very next verses say John wrote down the signs so that later readers, who couldn't see for themselves, could believe through the testimony (John 20:30-31). Written testimony stands in for sight; evidence isn't being set aside.
The Bible teaches that all sincere religions lead to the same God.
The New Testament makes exclusive claims about Jesus (John 14:6; Acts 4:12). People may reject those claims, but the text does make them.
Being outwardly religious is itself the evidence of true faith.
James says religion is worthless if it doesn't change how a person speaks, and that pure religion is caring for orphans and widows (James 1:26-27).
Christians are meant to claim complete certainty about everything.
Paul warns against thinking we know as we ought (1 Corinthians 8:2) and says we now see 'a dim reflection' (1 Corinthians 13:12). The certainty claimed is centred on Christ, not on having every answer.

Sources: Berean Standard Bible (verse quotations) · Strong's Exhaustive Concordance (G4102, G228, G1097, G5039, G2356, G1175, G627, H3045) · Bauer-Danker-Arndt-Gingrich Greek-English Lexicon (BDAG) · Ignatius of Antioch, Letter to the Magnesians 10 (early use of 'Christianity') · Survey of Christian apologetic approaches: evidential, presuppositional, classical and experiential

Discussion

What do you make of it? Agree, push back, add a verse.

Loading…