Since you're convinced in your own mind, maybe you shed some light on these passages? It's not so cut and dry. The verb hagiazō which
@Paidiske referred to means to santify. Sanctification is the result of salvation. Below is Strong's definition:
ἁγιάζω hagiázō, hag-ee-ad'-zo; from
G40; to make holy, i.e. (ceremonially) purify or consecrate; (mentally) to venerate:—hallow, be holy, sanctify.
1Co 7:13 If any woman has a husband who is an unbeliever, and he consents to live with her, she should not divorce him.
1Co 7:14 For the unbelieving husband is made holy because of his wife, and the unbelieving wife is made holy because of her husband. Otherwise your children would be unclean, but as it is, they are holy.
1Co 7:15 But if the unbelieving partner separates, let it be so. In such cases the brother or sister is not enslaved. God has called you to peace.
1Co 7:16 For how do you know, wife, whether you will save your husband? Or how do you know, husband, whether you will save your wife?
Could it be that this was only in effect during that time when the gospel was first being taught? Maybe. But it's being taught today.