In discussing the conversion of Jews, C. S. Lewis once said, “In a sense, the converted Jew is the only normal human being in the world.” He continued, “Everyone else is, from one point of view, a special case dealt with under emergency conditions.” That is a way of stating the truth about Gentile conversion. God opened a “back door” and let us in as emergency cases. There are a lot of us, but we remain “grafted-in branches.”
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green