You can become a Jew just as you can become a Muslim or a Catholic etc.
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Converting to Judaism is not easy. It involves many lifestyle changes and about a year of studying.
Becoming a Jew is not just a religious change: the convert not only accepts the Jewish faith, but becomes a member of the Jewish People and embraces Jewish culture and history.
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If you marry somebody from one of those 3 religions, and you are not from their religion, you are likely to be "asked" to convert.