In order to convert, there is the shahada, but what if some has left Islam, how do you leave Islam? I am not thinking to leave Islam but I was just wondering how can someone go about leaving Islam? Is there something you say?
There is no specific ritual for leaving Islam. Uttering anything that implies disbelief in God, the Hereafter, the angels, the Scriptures or the Prophets would imply leaving Islam if the person utters it solemnly, that is if the person really expresses disbelief in their heart.
And God knows best.
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