You're off topic, but after all you are only responding to my own comments. I forgive us both.
I have always used the term 'gentile' to describe a person who is a non Jew. So I am uncertain what you mean by a gentile Christian, as most would agree that Christians are non Jews anyway.
I agree that Christianity started out as a Jewish sect, but I wouldn't consider Christians today to be Jews, except perhaps for that select few who are trying to emulate the original Jewish Christian movement (if are there such people).
I don't have any idea of the numbers. I would agree this is probably true of secular Jews, but not the Orthodox.
So you think Christians are the true Jews? Is this what you are suggesting, and that Jews are not really Jews?