Such a person is not Muslim and he must be shown and given the evidences to prove that he is committing an act of apostasy.

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This is not permissible. Punishing someone is up to the Muslim ruler, judge, or authorities of the country.

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No, and why would you want to do such a thing?

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We don’t call people as such before fulfilling the conditions and ensuring there are no obstacles. If the scholars spoke to him and clarified things to him but he still insists on that, such a person would be considered as a kafir.

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