If you broke it you pay for it. This is accountability. Otherwise known as JUSTICE.
Accountability is not justice. Terms like justice or sin you can bend in any way you like. Depending on what basis you judge or who is setting the rules.
Getting what you "deserve" is Justice.
The same. Who is determinig what you deserve for certain deeds?
All the questions raised by Terry are based on the assumption, that there is a defined perception of justice or injustice, of good or bad, sin and although grace.
In other words, you need god, to come to ask these questions.
If there is no god, the whole conception of sin is obsolete. And justice is what an individual, a group or a society declares as such.
Reading this threat I'm so happy to be an atheist. I don't have to spend my time thinking about what God may think about what I'm thinking. I don't care about sin and do not waste usefull energy in blaming a nonexisting god for his creation failiures regarding mankind. Instead of trying to find the right place in the god-and-evil-matrix oft the bible (or any other religion), I look after myself and my beloved ones without doing harm to anybody else.