Paul, in Romans, said that, He is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: but he is a Jew, which is one inwardly; and circumcision is that of the heart.   So, in a strong sense, I see myself as being a Jew, whose circumcision is of the heart, but one who, outwardly being a Gentile, is not burdened by the Law. And so, from this Christian's perspective, Judaism lacks only Jesus as its Messiah.
Who is my mother, my brother my sister, those that do the will of my father. I do not regard or measure people according to their faith but in the way they emerge into the world. And of those, it is between those who need help and those who help, not whether they are good or bad.