A couple things about that verse. First, it doesn't say they are saved by the believing parent, or spouse. It says sanctified. Whatever Paul means in that context cannot mean saved, because that would be saying an unrepentant sinner gets in on a technicality. I can't imagine that's very fair dealings with the rest of the sinners who get cast into hell, just because they didn't luck out having someone in the family who got 5 extra get out of hell free passes to hand to family members once they joined club Jesus. That is what that would amount to.
But worse than that, what about the children of unbelieving parents? What about the billions of children who are not born into Christian families? Does God send them to hell? Do you believe he does?
Don't they also, or even far morseo, have a leaning to do good primarily? Or are human beings primarily wicked first and foremost above being good? One wonders how humans survived as a species then, why we didn't all die off in the first few generations after we ate ourselves alive.
I can't think of anyone going to hell. I can't even imagine hell as something God created and sends people into. I see God as Love, not hate.
Even if a person can't think of anyone going to hell, the Bible teaches that the day Jesus died he went to hell - Acts of the Apostles 2:27
Not to some religious-myth hell taught by false clergy, but to the Bible's hell which is simply the temporary grave for the sleeping dead.
I find salvation comes at the end, so a minor child is protected, so to speak, by the parent until mature.
Just like dead Jesus, dead people go to hell, Not to some religious-myth hell but biblical hell which is the common grave for mankind.
In other words, the Bible's hell is simply mankind's temporary stone-cold grave for the sleeping dead.
Sleep in death is what Jesus taught - John 11:11-14 - and so does the OT teach sleep in death - Psalms 115:17; Isaiah 38:18; Ecclesiastes 9:5
'Death' is the total price tag that sin pays, Not death plus any post-mortem penalty, No double jeopardy in death, just unconscious sleep.
People who died before Jesus' died were Not born into Christian families. - John 3:13
Jesus' ransom can cover such dead ones - Matthew 20:28
They can have a resurrection - Acts of the Apostles 24:15
Good point about can't imagine hell as something God created because 'biblical hell' is Not hot.
For example: when King James translated the word Gehenna into English as hell fire that put the flames in the grave.
Gehenna was just a garbage pit outside of Jerusalem where things were destroyed.
Thus, Gehenna is a fitting word standing for destruction as in the wicked will be destroyed forever - Psalms 92:7; Psalms 104:35
To teach the dead suffer is slandering God because that attributes to God the personality of a devil !
God hates suffering - Jeremiah 19:5
Satanic lies about death (the dead are alive) would mean the dead are death proof thus there would be No need for a resurrection.
The living do Not need a resurrection.
If the dead are living there would be No need for Christ to have given his life for us.