Why is one who doubts in Islam or the divine essence considered an unbeliever and cast out from Islam, taking into account the Hadith: "No one who has a mustard seed's weight of pride in his heart will enter Paradise, nor will anyone who has a mustard seed's weight of faith in his heart enter the Fire," and that doubt is involuntary while disbelief is a choice?
Source: FtawySummarized from the full answer at Ftawy · imported Sep 2, 2026
Doubting the existence of God is disbelief (kufr), while being afflicted by waswasah (whispers from Shaytan) to the contrary are merely thoughts with which Satan attacks the heart. The one who doubts has no faith in his heart, whereas the one afflicted by waswasah is a Muslim with clear faith.
Summarized from the full answer at Ftawy · imported
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