Complex sentence: The term "cultural Christian" usually is used pejoratively by more religious, usually fundamentalist, Christians, or those belonging to charismatic movements, to describe these individuals, whose spiritual understanding or practice they see as underdeveloped, superficial, or lacking obvious fervor.
Split into simpler sentences: The term "cultural Christian" is often used pejoratively by more religious, usually fundamentalist, Christians. Alternately, those belonging to charismatic movements, use the term to describe individuals, whose spiritual understanding or practice they see as underdeveloped, superficial, or lacking obvious fervor.