The seriousness of throwing over hell whilst still clinging to the Atonement is obvious. If there is no punishment for sin there can be no self-forgiveness for it. If Christ paid our score, and if there is no hell and therefore no chance of our getting into trouble by forgetting the obligation, then we can be as wicked as we like with impunity inside the secular law, even from self-reproach, which becomes mere ingratitude to the Saviour.