Should a newly-saved Christian marry the person she has been living with?

What about a case where only one of the partners trusts Christ?

Breaking the physical relationship is necessary. While doing what is right, the believer should exercise care not to reduce the likelihood that the unbeliever will also receive the gospel. If, within a short period of time, the unbeliever shows no sincere interest in the gospel, the believer’s choice is clear: "be not unequally yoked together with unbelievers" (2 Corinthians 6:14). Even if the unbeliever responds to the gospel and is eventually saved, their past relationship may indicate that they shouldn’t marry. Those who had the most to do with their conversion should help them make this evaluation, but leave the choice to them.

If there are children, breaking the physical relationship is still necessary. The choice regarding marriage is more complex, though. Allowing some time for God to save the unbeliever may still be advisable. If the relationship has been abusive or has deteriorated badly in the past, it may be best not to marry. The new believer needs the input of believers he trusts and who know the situation well.

Paul’s reasoning in 1 Corinthians 7:14, indicates the believer will increase the likelihood that the unbelieving partner and the children will be saved if he and the unbelieving parent of his children decide to marry.

D. Oliver