Polly, I would like to agree with you on 1 Cor. 7, because we are so much alike, but I just don't know if Paul would agree that his verse can be forced to say that a Christian who has adultery is the same as a pagan. But, you could be right. John might agree with you, as he said those who commit (willful) sin, has as their father, the devil. Christians do not commit willful sin, because they are dead to sin, thus any sins are unintentional. And as James would say, their desires may not have been become sin.
Because adultery was punishable by death in the OT, I think that is more in keeping with why the innocent party is free just as a if their spouse is dead; but ONLY if the adulterer leaves as in your verse. So it could be a combination of both of our views.
But, Paul's verse could also mean something far less than the "unbeliever" committing adultery. Say a married couple is in Wicca or Scientology, and one becomes a Christian. If the other decides to leave, the Christian is free, but they must not instigate the divorce. Stay put, as you and I did in our marriages, until God causes the mentally ill abuser, or the adulterer to leave. I for one learned obedience to God through suffering. The suffering was so bad, it has caused me to be super vigilant to not sin willfully - ever.
The basis of my belief that 1 Corinthians 7 allows for remarriage is not only the fact that it says clearly what it does... but more than that, Matthew 5:17-18 says what it does.
Jesus was a Law-abiding Jew. He lived among Law-abiding Jews. When he preached, he was preaching to Law-abiding Jews.
Yes, Jesus fulfilled the law. But what does that mean? It simply means that He did it all. He BECAME all that God foreshadowed in all the types and figures of the Old Testament Law.
But Jesus' fulfilling the Law in no way took away or changed God's morality.
What was once holy, will forever be holy.
What was once an abomination to God, will forever be an abomination to Him.
And Paul says clearly in Romans 7:12 that the Law is holy, and the commandment holy, and just, and good.
Paul says in Romans 8:4 that it's the old, once-established moral law of God, that is fulfilled in us, who walk after the Spirit.
And John backs this up, by defining sin, under the New Covenant, like this:
"
sin is the transgression of the LAW." 1 John 3:4
THAT'S the New Testament definition of SIN.
Jesus fulfilling the law does not do away with God's eternal moral code of good behavior.
Jesus never came to give us a new rule-book.
He came to remove the condemnation from those of us who believe in Him.
The condemnation of the Law.
But the moral code still stands. It was given for sinners. For the lawless, for the disobedient, etc. And it still applies to them!
Therefore, the moral code once given by God in Deuteronomy 24:1-4 is still holy, just, and good, according to Paul.
All that Jesus and the Apostles said about the Law, did not do away with or change the moral code of God's holy Law. Because it was perfect. Psalm 19:7
The idea that Jesus did away with all those old rules, and gave us a new set, says the Old Testament Law was imperfect, as a standard of right and wrong.
But that is not what the Bible says, in either Testament!