1 Corinthians 7:14
For the unbelieving husband is sanctified through his believing wife, and the unbelieving wife is sanctified through her believing husband. Otherwise your children would be unclean, but now they are holy.
Does this mean if a person marries an non believer or unbaptized he or she will be “saved” through their partner?
Holy and saved are not exactly the same thing.
One must be holy if they are saved, but you can be holy without being saved.
Holy means precious to God, and implies cleanness.
(Jesus says that If a man is merely cleaned, he can still be invaded by seven spirits worse than the first. )
Therefore: A pregnant woman does not automatically make her children “saved” although Paul is making her out to be a source of holiness for her children. ( Clean vs. Unclean. )
You can look at it like this… When a man and a woman are married (Jesus and his Church) she is saved by him because they are one Flesh. But if he dies or divorces her for impurity, then she is damned unless she finds another spouse.
A human is the “likeness” of Jesus. Jesus is the head and source of life for his church.
We can reason by analogy that a wife of a Catholic receives grace because of her husband. But when he dies (for he is not the source of Eternal life) she has a problem
Her source of grace was through a husband who receives grace from the Son.
Human Marriage ends at death. That is part of the punishment Adam and Eve brought on marriage.
When you look at it like that, the reverse must also be true. The wife who sanctifies the unbelieving husband is granting him Grace because she is the body of Christ.
She is not the fountain of eternal life, but only a conduit.