وَلَا يَخْرُجُ الْعَبْدُ مِنَ الْإِيمَانِ إِلَّا بِجُحُودِ مَا أَدْخَلَهُ فِيهِ
A servant does not depart from faith except through denial of what brought the servant into it.
Juhud refers to conscious rejection of an established tenet. Affirmation of the foundational truths establishes faith; their denial is a different matter from a person's failings in conduct.
A visible sin or neglect of religious practice must not automatically be called an act of doctrinal denial.