Interesting article.
Narkissos, Pete.
We know that some parts of the letters were addressed to issues that arose, even though the issues aren't always stated. Thus, understanding the meaning is like playing Jeopardy--we have the answer and have to figure out the question.
Considering the entire context of 1 Cor. 7, is it possible this kind of question arose:
"My spouse is not a believer. Should I divorce my spouse and marry a believer?"
To which Paul answers, "In marriage, the two have become one flesh. What God has joined together, let man not separate. Therefore, according to the word of the Lord, you are one flesh with your spouse. Your unbelieving spouse, while not in Christ, is considered set apart for your sake and the sake of your children, who have no say in this matter. To divorce your spouse because he or she does not believe is not proper cause. Thus, you would be committing adultery were you to remarry, even to a believer, and the children born to you would be from an illicit union. For the sake of your children, you should remain with your spouse if this person is willing."
I don't think the article clarified whether the passage referred to children already living, or yet to be born, or did I miss that?