Is there any proof to that? Like i said the Reform Liberal and Re constructionist Jews and many others across the diaspora and in israel itself recognize people born to a jewish father and a non jewish mother as a jew. The state of israel does not say nor does it say it in the law of return that to be a jew you must be born to a jewish mother. They use the Nuremberg laws to decide who is and who is not a jew. They also recognize jews of any affiliation including Reform Liberal Re constructionist Humanist karaite etc who recognize that a person born to a jewish father can be jewish. the same goes with Birthright israel my friends where born to jewish fathers not mothers had jewish last names and practiced judaism like other jews with jewish mothers and they are considered jews and allowed the free trip to israel. Also the majority of the state of israel is secular and im sure they do not believe strictly to Halakhic standards of who is and who is not a jew. I understand the discrepencies in numbers due to many factors like not having proper statistics information and people who are jewish not calling them self jewish for certain reasons and of course defining who is a jew. All im saying is because of this we should assume there are more Jews in the world then 13 Million. The numbers are on the low end and a few years outdated I believe from 2000. Also correct me if Im wrong isnt the population of jews in Israel now according to the recent CBS report 5.6 Million 76% thats what it says In Demographics and the number of jews In Israel are the most reliable we have if not 99% reliable thus the list should be changed to reflect this.