Israel; and after that, America.
Jerusalem.
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europe and north america
There is no current leader of Judaism.
Judaism is a monotheistic religion.
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Judaism is not a centralised religion and does not have a single leadership. The members of Judaism are called Jews.
In very approximate numbers: 1/2 of the world's Jewish population now lives in Israel, the other 1/2 is distributed among 135 other countries, with some of the largest communities in the USA, Canada, Argentina, France, England, Australia.
For Judaism and Christianity it is Jerusalem. For Islam it is Mecca.
people
Moses.