Excellent article. I think of Peter's response:
Joh 6:68-69 Simon Peter answered him, "Lord, to whom shall we go? You have the words of eternal life, and we have believed, and have come to know, that you are the Holy One of God."
If this is what one truly believes, and they can honestly say they know, then they are born again. But it is a question each of us must ask ourselves.