How do we defend the faith?
Question 60001
Every believer, at some point, will be asked to give a reason for why they believe what they believe. Whether it comes from a sceptical colleague, a curious neighbour, or a family member genuinely wrestling with spiritual questions, we need to be ready. But what does it mean to “defend the faith”? And how do we do it in a way that honours God and genuinely helps the person asking? It is not necessarily what you believe, but why.
The Biblical Mandate for Apologetics
The word “apologetics” comes from the Greek ἀπολογία (apologia), meaning a reasoned defence or answer. We find this word in 1 Peter 3:15, where the apostle writes: “but in your hearts honour Christ the Lord as holy, always being prepared to make a defence to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect.” This is a command. Peter expects that believers will face questions about their faith and that they should be ready to answer them.
Peter is writing to Christians who are suffering for their faith, scattered throughout Asia Minor, present day Türkiye. They are living in a hostile environment. And yet, Peter does not tell them to keep their heads down and stay quiet, keep your faith private. No. He tells them to be prepared. The assumption is that a life lived faithfully for Jesus will provoke questions. People will want to know why you have hope when circumstances suggest you should have none.
Yet before Peter tells us to give a defence, he says, “in your hearts honour Christ the Lord as holy.” The starting point for all apologetics is worship. If Jesus is not Lord of your life, if He is not set apart as holy in your heart, then your defence will ring hollow and fake. And today, people are all about authenticity.
Examples from Scripture
The Bible is full of examples of believers defending the faith. In Acts 17, Paul stands in the Areopagus in Athens, surrounded by Epicurean and Stoic philosophers. He does not simply quote Scripture at them, though he certainly could have. Instead, he meets them where they are. He observes their culture, notes their altar “To the unknown god,” and uses this as a bridge to proclaim the true God who made heaven and earth. Paul reasons with them, appeals to their own poets, and presents the resurrection of Jesus as the climax of his argument.
What do we learn? Paul did not abandon the Gospel, but he communicated it in a way that engaged his audience. He understood their worldview and addressed it directly. In other words, Paul’s head was not in the sand about other people’s worldviews and belief-systems. In Acts 26, when Paul stands before King Agrippa, he gives his testimony and appeals to the fulfilment of Old Testament prophecy. He adapts his approach to his audience whilst never compromising the truth.
Jesus Himself engaged in apologetics. When John the Baptist, languishing in prison, sent messengers to ask, “Are you the one who is to come, or shall we look for another?” (Matthew 11:3), Jesus did not rebuke him for doubting. He answered the question. He pointed to the evidence: “the blind receive their sight and the lame walk, lepers are cleansed and the deaf hear, and the dead are raised up, and the poor have good news preached to them” (Matthew 11:5). Jesus appealed to the evidence of His ministry, evidence that fulfilled the messianic prophecies of Isaiah 35 and Isaiah 61.
The Role of Evidence and Reason
Some Christians are suspicious of apologetics. They worry that relying on evidence and argument somehow undermines faith. But this misunderstands the nature of biblical faith. Faith in Scripture is not blind belief in the absence of evidence (knowing the what and not knowing the why). It is trust based on the character of God and the testimony He has given. The writer to the Hebrews defines faith as “the assurance of things hoped for, the conviction of things not seen” (Hebrews 11:1). This is a sound confident trust grounded in God’s promises and past faithfulness.
God Himself invites us to reason with Him. In Isaiah 1:18, He says, “Come now, let us reason together, says the LORD.” The Hebrew word יָכַח (yakach) means to argue a case, to prove, to decide. God does not demand blind acceptance. He invites investigation.
The resurrection of Jesus is the cornerstone of Christian apologetics. Paul makes this explicit in 1 Corinthians 15:14: “And if Christ has not been raised, then our preaching is in vain and your faith is in vain.” Christianity stands or falls on the historical reality of the resurrection. This is not a matter of private religious experience that cannot be examined. Paul appeals to eyewitnesses, over five hundred of them, most of whom were still alive when he wrote (1 Corinthians 15:6). He is essentially saying, “Go and ask them yourself.”
The Limits of Apologetics
Having said all that, we must be clear about what apologetics can and cannot do. Apologetics can remove intellectual obstacles. It can answer objections. It can demonstrate that Christianity is reasonable and coherent. But apologetics alone cannot save anyone. Salvation is the work of the Holy Spirit. As Paul writes in 1 Corinthians 2:14, “The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned.”
Plus we are told people love darkness rather than light (John 3:19-20). It is not an intellectual problem first and foremost, but a spiritual and sin one.
This should keep us humble. We are not trying to argue people into the kingdom. We are seeking to clear away the rubble so they can see Jesus clearly. The Holy Spirit convicts of sin, righteousness, and judgement (John 16:8). Our job is to be faithful witnesses, to give honest answers, and to trust God with the results.
This is why Peter adds those crucial words: “with gentleness and respect.” The manner of our defence matters as much as the content. If we win the argument but lose the person, we have failed. Apologetics divorced from love becomes mere intellectual sparring. We are not trying to score points; we are trying to win souls. This is the goal.
So now what?
So how do we go about this practically?
Know what you believe and why. You do not need a PhD in theology, but you should be able to articulate the Gospel clearly. Who is Jesus? Why did He die? What does it mean to trust in Him? If you cannot explain these things simply, spend time studying until you can.
Listen carefully to the person asking. Many questions are not really about intellectual difficulties; they are about pain, disappointment, or moral resistance. Someone who asks, “How can a good God allow suffering?” may be wrestling with their own grief. Before you launch into a philosophical answer, ask what prompted the question. Show that you care about them as a person.
Be honest about what you do not know. It is perfectly acceptable to say, “That’s a good question. I don’t know the answer, but let me think about it and get back to you.” “Let’s meet for a coffee next week”. Pretending to have all the answers will damage your credibility. Intellectual honesty is itself a form of witness.
Always point to Jesus. Every apologetic conversation should ultimately lead to Him. The goal is to introduce people to the living Saviour who died for their sins and rose again.
“but in your hearts honour Christ the Lord as holy, always being prepared to make a defence to anyone who asks you for a reason for the hope that is in you; yet do it with gentleness and respect.” 1 Peter 3:15
Bibliography
- Craig, William Lane. Reasonable Faith: Christian Truth and Apologetics. 3rd ed. Crossway, 2008.
- Geisler, Norman L. Christian Apologetics. 2nd ed. Baker Academic, 2013.
- Groothuis, Douglas. Christian Apologetics: A Comprehensive Case for Biblical Faith. IVP Academic, 2011.
- Lewis, C.S. Mere Christianity. Geoffrey Bles, 1952.
- McGrath, Alister E. Mere Apologetics: How to Help Seekers and Skeptics Find Faith. Baker Books, 2012.
- Moreland, J.P. Scaling the Secular City: A Defense of Christianity. Baker Academic, 1987.
