Eating meat slaughtered by a person who has moved from one kaafir religion to another kaafir religion

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One of our brothers/sisters has asked this question:
If a Christian becomes an atheist communist or a Buddhist, is it permissible to eat meat slaughtered by him? Or if a Jew becomes a Christian, is it permissible to eat meat slaughtered by him?
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Answer:

Praise be to Allaah.

The fuqahaa’ are agreed that if a person from the People of the Book moves to a religion which is not that of the People of the Book, meat that is slaughtered by him cannot be eaten. But if he moves from his religion to another religion of the People of the Book, such as a Jew who becomes a Christian or vice versa, then most of the Hanafi, Maaliki, Shaafa'i (according to one view) and Hanbali fuqaha’ say that it is permissible to eat meat slaughtered by him. And Allaah knows best. 

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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