There are a number of official statistics concerning the population of the Jewish Race and the Religion. But I have never seen one which tried to account for the definition used on this site. A definition which never expires, and does not concern itself with personal practices, knowledge, or the purity of the genetics. For thousands of years, particularly during the birth of Christianity, Jews have left their faith and their communities, most of them certainly forgetting their heritage after a generation or two. Has their ever been any work done to estimate the number of lost Jews, and calculate a probably number of descendants (on the mothers side)?

In short, going by the biblical definition of who is a Jew, what would be a good estimated population number?

  • 1
    @GershonGold But an educated guess may be possible.
    – Ypnypn
    Commented Sep 17, 2015 at 20:06
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    @GershonGold, judaism.stackexchange.com/questions/60661/…
    – Yishai
    Commented Sep 17, 2015 at 20:10
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    Is this on topic?
    – Double AA
    Commented Sep 17, 2015 at 20:21
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    @DoubleAA, it's asking "How many Jews are there according to Judaism's definition of 'Jew'?", where that latter definition exists. IMO that's on-topic, much as "How many kosher sukos are built each year?" is. (And the how-many-Jews question is IMO more interesting than the how-many-sukos question. But that's neither here nor there.)
    – msh210
    Commented Sep 17, 2015 at 20:32
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    "Biblical definition" is an odd thing to call it. I mean, it's based on the Bible, but isn't explicit therein AFAIK. "Halachic definition" would be more accurate (and, I think, more usual).
    – msh210
    Commented Sep 17, 2015 at 20:33


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