Can Christians marry non-Christians?

Question 11060.

Marrying an unbeliever is a question I have been asked in tears more often than almost any other, usually by someone who already knows the answer and is hoping I will find a way round it. So let me be honest and kind at the same time, because both are needed here.

The New Testament does not leave this open. It says a believer is free to marry whom she wishes, only in the Lord, and that phrase is not decoration. But the reason behind the command matters as much as the command, and that is where I want to spend most of our time.

What Scripture actually says

Paul writes about a widow that she is free to be married to whom she wishes, only in the Lord. You can read it at 1 Corinthians 7:39. The freedom is real and the qualification is real, and Paul sees no tension between them.

The wider principle comes in his warning not to be unequally yoked with unbelievers, asking what partnership righteousness has with lawlessness and what fellowship light has with darkness. The image is of two animals under one yoke pulling in different directions, which is a picture of strain rather than of sin as such.

Behind both stands the Old Testament pattern, where Israel was repeatedly warned not to intermarry with the surrounding nations. The reason given is never racial. It is always that they will turn your sons away from following me, and the history of Solomon proves the point at unbearable length.

The Old Testament warning is put most starkly in Deuteronomy 7:3 to 4, where the danger of marrying an unbeliever is spelled out in terms of the heart being turned away. The Hebrew verb for turning aside there, sur, is the same word used again and again for Israel’s drift into idolatry. Nobody intends it. It happens by degrees.

Why the command is a kindness

This is where I want to push back against the idea that God is being restrictive for the sake of it. Marriage is a shared life aimed in a shared direction. Two people who disagree about the deepest question there is will find that disagreement surfacing in every ordinary decision they make.

It surfaces on Sunday morning. It surfaces over money, over how the children are raised, over what happens when a parent dies, over what you do with a Saturday. Marrying an unbeliever does not mean you will be miserable, but it does mean that the thing which matters most to you is a thing you cannot share with the person closest to you.

I have sat with Christians thirty years into such a marriage. They are not all unhappy, and I would never speak of them with contempt. But almost every one of them has described the same quiet loneliness at the centre of an otherwise good life.

Think about what marriage is for. Scripture presents it as a picture of Jesus and his church, a covenant partnership aimed at holiness as much as happiness. Marrying an unbeliever puts a picture of union on public display while the deepest union is absent, and that is a strain no amount of goodwill removes.

Marrying an unbeliever and the children

The practical weight of this usually lands on the next generation. Children are remarkably good at detecting which parent actually believes what they say, and a household divided at the root sends a message no amount of Sunday school can undo.

That does not mean children of such marriages are lost. God is gracious, and I know many believers who came to faith through a praying mother in a home where the father had no interest. But it does mean the believing parent carries the whole spiritual weight alone, for decades, which is a heavier load than most people anticipate when they are twenty three and in love.

Anyone considering marrying an unbeliever should think about that scene rather than about the wedding. The wedding lasts a day and the household lasts a lifetime.

What about the missionary marriage?

The argument I hear most often is that the unbelieving partner will be won over. Sometimes that does happen, and when it does I rejoice without reservation. But it is a poor basis on which to make a covenant, because it commits you to a lifelong union on the strength of an outcome you cannot control.

Peter does speak of husbands being won without a word by the conduct of their wives, and that passage is a genuine comfort. Notice, though, that Peter is addressing women already in that situation, not advising single women to enter it deliberately. A remedy for a hard providence is not a strategy for choosing one.

There is also an uncomfortable statistic behind the romance. In my experience the drift is more often the other way. The believer’s zeal cools long before the unbeliever’s heart warms, because a shared life exerts a steady pressure in whichever direction the household is actually pointed.

There is also a question of what you would be asking the other person to accept. Marrying an unbeliever means asking someone to commit their life to a person whose highest loyalty they consider mistaken. That is not fair to them either, and treating a spouse as a project rarely ends well for anybody involved.

What if you are already married?

This needs saying clearly and early, because some readers married before they were converted, or married as a believer and now regret it. Paul addresses exactly this. If a brother has a wife who is an unbeliever and she consents to live with him, he should not divorce her, and the same applies the other way round.

You are not living in ongoing sin by remaining married. Your marriage is a real marriage, and God is not asking you to undo it. The command about marrying an unbeliever governs the decision to marry, and once the covenant is made a different set of instructions applies.

Paul goes further and says the unbelieving spouse is made holy because of the believing one, and the children are holy. Whatever the full force of that phrase, it plainly means the believing partner is not contaminated but is a channel of blessing into that home. Live accordingly.

Discerning genuine faith

A word of caution in the other direction. Some believers marry someone who professes faith conveniently and discover afterwards that the profession did not survive the honeymoon. Marrying an unbeliever is not avoided simply because somebody agreed to come to church during the courtship.

Look for the marks of real life rather than the language of it. Does this person read Scripture when nobody is watching? Do they confess sin, submit to teaching, give, serve, and belong to a local church that knows them? Is there any evidence of the Spirit’s fruit in how they treat people who cannot do anything for them?

And ask people who know you both, especially those who will tell you what you do not want to hear. A believer in love is not a reliable judge of the situation, and knowing that about ourselves is the beginning of wisdom.

Paul told Timothy that the Lord knows those who are his, and that everyone who names the name of the Lord should depart from iniquity. Fruit is the test he applies, not vocabulary. Applied to this question, marrying an unbeliever is not avoided by a form of words at the front of a church, and I would rather ask uncomfortable questions before a wedding than sit with the consequences after one. You can read Paul’s line at 2 Timothy 2:19.

The hard providence of singleness

I do not want to pretend this command is cost free. For some believers, holding this line means remaining single for years or for life, and in a small church with few options the mathematics can be brutal. That is a real grief and deserves to be treated as one.

Scripture does not promise everyone a spouse. It does promise that God gives good gifts, that his grace is sufficient, and that the single believer is a whole person with a full place in the family of God. Paul, who wrote the command, was himself single and considered it an advantage.

I have written more on this in biblical guidance for single Christians, because a command like this can only be borne inside a church that actually values its unmarried members rather than treating them as unfinished.

Where the pressure usually starts

Almost nobody wakes up one morning and decides to marry an unbeliever. It begins much earlier, with a friendship that deepens, a coffee that becomes a habit, a relationship that has drifted well past the point of easy exit before anyone names it.

That is why the question of dating matters so much, and why I have addressed it separately in whether Christians can date non-Christians. Decisions made early are cheap. Decisions made late are expensive, and by then the heart has already voted.

If you are drifting in that direction now, the kindest thing you can do for both of you is to be honest sooner rather than later. It is far better to have a painful conversation in month three than a marriage built on a hope that neither of you ever discussed.

So, now what?

If you are single and being drawn towards someone who does not share your faith, talk to a mature believer this week rather than next year. Say it out loud to somebody who loves you and will not simply agree with you. That single conversation has saved more people than any amount of private wrestling.

If you are already married to an unbeliever, stop carrying guilt that does not belong to you. Your marriage is not a mistake God cannot work with, and your calling now is to love your spouse well, pray steadily, and let your life make the gospel look attractive rather than nagging them towards it.

And if you are part of a church, look around at the single believers in it. The command about marrying an unbeliever is far easier to keep in a congregation where unmarried people are genuinely known and included. What would it take for yours to be that kind of church?

“A wife is bound to her husband as long as he lives. But if her husband dies, she is free to be married to whom she wishes, only in the Lord.”

1 Corinthians 7:39, ESV