Why the jewish people are few millions only while they are very old religion?

Question

hindus are almost 1 billion, budhist are almost one billion, Christians are over 2 billion and muslims are over one billion  , why the jews or Judaism is still under 30 million

Answer

Christianity,  Hinduism, Islam and other religions have been & are open to all races. Judaism has been tied very strongly (although not wholly exclusively),  to those of Jewish descent.

Why the jewish people are few millions only while they are very old religion?

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