Which formulation represents a well-established Sunni view of a person who commits a grave sin?

The Four Proofs: Fiqh, Uṣūl al-Fiqh and Kalām

• Faith is necessarily extinguished until repentance after every grave sin
• Discussion of both transgression and faith is irrelevant to the grave sinner
• Always treating the grave sinner as an unbeliever in worldly rulings
• A grave sin alone does not necessarily extinguish faith; other grounds for unbelief must be separately assessed