Ol' Arch-Pope is perpetuating the lie that some sins are mortal and some venial.
All sin, without the Savior can send you to hell.
Some sins have large consequences that lead to an early death.
The true believer who is saved knows that all sin grieves the heart of his Savior and needs to be confessed.
That is why some sins can be called mortal, though this is relative to the light and grace one has been given. Thus,
For this cause many are weak and sickly among you, and many sleep. For if we would judge ourselves, we should not be judged. But when we are judged, we are chastened of the Lord, that we should not be condemned with the world. (1 Corinthians 11:30-32)
Then there is apostasy against which Scripture warns believers. (Gal. 5:1-5; Heb. 3:12; 10:25-39)
The true believer who is saved knows that all sin grieves the heart of his Savior and needs to be confessed.
Indeed, and confession of sin once convicted of it is a characteristic of a believer, and it is the heart-purifying faith (Acts 15:9) out of a contrite penitent heart which justifies, being counted for righteousness, (Rm. 4:5), even if one is ignorant of sins. Thanks be to God.