Is sincere repentance for major sins, including those that may constitute apostasy, sufficient without being certain of having fallen into the kind of disbelief that expels one from the fold of Islam? And what should be done if it later becomes clear that apostasy has occurred?

Allah thanked the questioner for her admiration of the website and congratulated her on the blessing of repentance, reminding her that this blessing necessitates gratitude. Among the best means of showing gratitude are striving for beneficial knowledge, righteous deeds, attending gatherings of goodness, and keeping company with righteous women.

The default is for a Muslim to remain in Islam, and one is not judged as an infidel except with certainty. It is not permissible to judge a Muslim as an infidel based on conjecture, for "whoever's faith is established with certainty, that certainty is not removed by doubt."

If one falls into disbelief, the door of repentance is open, and a general repentance is sufficient; there is no need to specify sins. "Whoever repents with a general repentance, this repentance entails the forgiveness of all sins, even if the specific sins are not recalled."

Finally, the questioner should avoid whispers (waswas), engage in obedience, and refrain from investigating whether she had previously uttered words of disbelief.