“Our scholars and pious predecessors have noted that every disobedience of Allah ta’ala carries within itself the taint of kufr (disbelief) to some degree. This is why one who is constantly involved in sins is considered to be endangering his imān.
A flagrant sinner will be disinclined to repent, and may eventually land himself in destruction by beginning to question faith, and eventually denounce faith in Allah ta’ala altogether (may Allah ta’ala protect us).”
Allāh ta‘ālā puts humans through trials to wake them up from their slumber, so that they may mend their ways.
Shaykh Mawlānā Muhammad Saleem Dhorat hafizahullāh