From Idolatry to Conversion: Judaism and Non-Jews: Conversion: Renouncing Judaism:
Can a Jew renounce Judaism?
Nothing can change a Jew's status - not even conversion to
another religion. A Jew remains a Jew no matter what he
does to repudiate Judaism.
If a gentile becomes a sincere convert to Judaism,
he becomes a Jew permanently. If he afterwards
rejects Judaism, he's an apostate, but Jewish law
still regards him as a Jew.
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