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It has been discussed many times on this site that a non-Jew may not observe Shabbat (in addition to various other mitzvot that are prohibited to non-Jews). We have also seen that a Jew who renounces Judaism, while not losing his official Jewish status, may have to undergo some kind of process to reaffirm his commitment to Judaism.

My question is, may a Jew who has renounced Judaism continue to observe Shabbat? Must he? Does it matter if he has converted to some other religion such as Christianity?

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You are referring to the Rama's requiring a dip in the mikva? He says clearly that that is only a rabbinic requirement. –  Double AA Apr 24 '13 at 5:20
    
What about if an apostate Jew poured you wine, is it considered yayin nesech? –  Aryeh Apr 24 '13 at 5:52
    
@Aryeh Some say it is forbidden as stam yeinam. –  Double AA Apr 24 '13 at 6:06
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@Aryeh, that question has been asked here somewhere. –  Seth J Apr 24 '13 at 12:21
    
@SethJ, Yes it is. Apparently it is yayin nesech, which strengthens this question. –  Daniel Apr 24 '13 at 13:17
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