I have read it. It does not discuss justification or salvation from our sin nature. If it did, then we Christians should marry multiple non-Christians so they would be saved and destined to heaven because we married them.
That is entirely contrary to the Gospel. Anyone who believes that is a heretic.
“HOLY”. It means separated. Distinguished from the world around them. And if anyone runs their household IAW the Word of God, then the household IS distinguished and separated from the surrounding world. But it does NOT mean the spouse and children will all go to Heaven. For all have sinned, and all have fallen.
“The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.” - Jesus Christ
You cannot be made a child of God by your wife’s belief, but only through your own. But if your wife believes, your entire household WILL be different than it was before.
“But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.”
If you wish to argue that men can be saved and justified in God’s sight by marrying a Christian woman, say so. Otherwise, my interpretation answers the meaning - when one member of a household is saved, the nature of the household is changed...but not all individuals within the household are cleansed of their sin and made children of God.
Are you trying to lesson the meaning of Holy? It goes a little deeper then what you seem to be trying to imply.
Greek - ἅγιά - hagios - 40 hágios – properly, different (unlike), other ("otherness"), holy; for the believer, 40 (hágios) means "likeness of nature with the Lord" because "different from the world." [http://biblehub.com/greek/40.htm]
Also used here;
Acts 7:33 "Then the Lord said to him, 'Take off your sandals, for the place where you are standing is holy ground.
And here:
Romans 7:12 Wherefore the law is holy, and the commandment holy, and just, and good.
And here:
2 Timothy 1:9 Who hath saved us, and called us with an holy calling, not according to our works, but according to his own purpose and grace, which was given us in Christ Jesus before the world began,
Try to diminish the significance if you want but I will not.