Is the past period, during which the questioner was heedless of his religion and committed sins and major transgressions, including intentionally corrupting some days of Ramadan by means other than eating and drinking, considered a period of disbelief (kufr), and is his return to obedience considered faith that absolves him of sins? If not, how can he expiate for what he missed and perform the obligatory duties he abandoned but does not remember?
You must repent to Allah Almighty by regretting what has passed, resolving not to return to it, and making up for what can be made up. This includes making up for the days missed in Ramadan, calculating them precisely or by strong presumption, and making up for missed prayers. A Muslim does not become an unbeliever by committing all sins unless he deems them permissible.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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