Can a Christian have real faith and still doubt?

Key facts

• In Mark 9:24 the father's words are πιστεύω· βοήθει μου τῇ ἀπιστίᾳ, "I believe; help my unbelief (apistia)". [Mark 9:24, NA28]
• Mark 9:14–29 is the same episode as Matthew 17:14–20, in which the disciples fail to drive out a demon and Jesus speaks of their "little faith". [Mark 9:14–29; Matthew 17:14–20]
• In Matthew 14:31 Jesus reaches out, catches Peter and says, ὀλιγόπιστε, εἰς τί ἐδίστασας; "you of little faith, why did you doubt?" [Matthew 14:31, NA28]
• Distazō (διστάζω), "to doubt, waver", occurs in the New Testament only in Matthew 14:31 and 28:17. [BDAG, s.v. διστάζω]
• In Matthew 28:17 the disciples worshipped the risen Jesus, οἱ δὲ ἐδίστασαν, "but some doubted"; the commission of verses 18–20 follows. [Matthew 28:17–20, NA28]
• James 1:6–8 warns that a person who asks God for wisdom while wavering (diakrinomai) is dipsychos, "double-minded". [James 1:6–8, NA28; BDAG, s.v. δίψυχος]
• Jude 22 tells readers to show mercy to those who are wavering or doubting (diakrinomenous). [Jude 22, NA28]
• Before believing God's promise in Genesis 15:6, Abraham questioned God about his childlessness (Genesis 15:2–3). [Genesis 15:2–6]
• In 1 John 1:9 "confess" is homologeō (ὁμολογέω), "say the same thing as", and God is pistos (πιστός), faithful or reliable. [1 John 1:9, NA28; BDAG, s.v. ὁμολογέω, πιστός]

Key terms

pistis πίστις

trust or reliance placed on a person judged reliable

apistia ἀπιστία

unbelief, lack of trust (Mark 9:24)

distazō διστάζω

to doubt, to waver, to hesitate (Matthew 14:31; 28:17)

oligopistos ὀλιγόπιστος

'of little faith' (Matthew 14:31)

diakrinomai διακρίνομαι

to be divided, to waver, to doubt (James 1:6; Jude 22)

dipsychos δίψυχος

double-minded; literally 'two-souled' (James 1:8)

homologeō ὁμολογέω

to confess; literally 'to say the same thing as' (1 John 1:9)

pistos πιστός

faithful, reliable; used of God in 1 John 1:9

Explanation

Faith and doubt in the same person

If faith meant a feeling of complete certainty, any doubt would cancel it. The New Testament does not describe faith that way. The father in Mark 9 brings his son to Jesus, which is itself an act of trust, and in the same breath admits his unbelief. Peter steps out of the boat towards Jesus, then fears the wind. Some of the disciples who worship the risen Christ still hesitate. In each case, Jesus' response continues: he heals, he catches, he commissions. These texts do not make doubt a virtue, but they show that it can coexist with real trust.

"Little faith" is still faith

Matthew uses two different words. The crowd in Matthew 17:17 is apistos, without faith. The disciples, and Peter in Matthew 14:31, are called oligopistos or charged with oligopistia, "little faith". The Weight of God reads this as a diagnosis of faith that is real but misplaced: "The crowd had nothing. The disciples had something, but it was poverty-stricken." The book illustrates it with a child fighting sleep on her father's chest. She is trusting him, but she has not yet fully let go: "They have real trust, and it's genuinely aimed at me."

Is doubt a sin?

The New Testament does not treat wavering as harmless. James 1:6–8 describes the doubter as dipsychos, divided between two loyalties, and Jesus asks Peter why he doubted. But the same texts are gentle with doubters. Jesus catches Peter before he questions him, and Jude 22 tells the church to be merciful to those who waver. The Weight of God does not classify doubt itself as a sin. It locates the problem in where a person's weight is resting, rather than in the presence of questions.

Questions are not the problem

Abraham, the Bible's model of faith, raised his childlessness with God before he believed the promise (Genesis 15:2–6). The Weight of God notes that he did not ignore the evidence: "In fact, he raised it as an objection to God." In its reading of Ephesians 6:16 the book distinguishes honest questions from what threatens faith: "The 'flaming arrows of the evil one' are not intellectual doubts." It describes them instead as temptations to move one's reliance off God and back onto oneself.

When trust slips

The book treats the slipping of trust as an ordinary part of the Christian life. It points to Paul, who describes doing what he does not want to do (Romans 7:15–19) and then writes that there is "now no condemnation for those who are in Christ Jesus" (Romans 8:1, NIV). It describes the slippage as quiet: "The old architecture reasserts itself so quietly you barely notice until you're standing in the dark again." Its remedy comes from 1 John 1:9: tell the truth about where your trust has slipped (homologeō), and rely again on God, who is pistos. The book's conclusion is that the foundation does not depend on the strength of the one standing on it: "Whether you hold or not, it holds."

Common misunderstandings

• "If I doubt, I don't really believe." Correction: the father in Mark 9:24 says both at once, and Jesus helps him. Little faith in Matthew is still faith, distinct from having none.
• "Doubt is just the same as asking questions." Correction: the book distinguishes intellectual questions from wavering reliance. Abraham questioned God and still trusted him.
• "Real faith never wavers." Correction: Peter, the disciples after the resurrection and the father in Mark 9 all wavered. The New Testament calls for steady trust, but it does not describe it as a believer's starting point.
• "Getting rid of doubt means trying to feel more certain." Correction: pistis depends on what it rests on. The book's remedy is to return to God, not to manufacture a feeling.

What the book argues

The Weight of God does not write a chapter on doubt, but its teaching applies directly. Chapter 7 argues that the disciples' problem was not a lack of faith but faith that had shifted partly onto their own track record and authority, and that the remedy is to let go of the remaining self-reliance. Chapter 8 separates intellectual questions from the "flaming arrows" that invite a person to stand on their own judgement. Chapter 12 treats repeated slipping as normal, and describes a simple pattern for returning: "1. Your weight slips. 2. You tell the truth about it. 3. The foundation receives you back." The book frames this as an invitation, not a guarantee of any particular feeling or outcome: "You can step onto it right now, and you can step onto it again tomorrow when your weight slips." Mark 9:24, Matthew 28:17, James 1:6–8 and Jude 22 are cited on this page as standard texts on doubt; the book itself does not discuss them.

In the book: Chapter 7: Good Soil; Chapter 8: Something You Cannot Prove; Chapter 12: How to Believe.

Sources

1. Arndt, William F., F. Wilbur Gingrich, Frederick W. Danker and Walter Bauer. A Greek-English Lexicon of the New Testament and Other Early Christian Literature, 3rd edn (BDAG). Chicago: University of Chicago Press, 2000. Entries for ἀπιστία, διστάζω, διακρίνω, δίψυχος, ὀλιγόπιστος, ὁμολογέω, πιστός.
2. Novum Testamentum Graece, Nestle-Aland 28th edn (NA28). New International Version (NIV).
3. Wong, Matthew. The Weight of God: How to Believe. Australia, 2026. ISBN 978-1-7646297-3-7. Chapters 7, 8 and 12.