It's not a moral thing

In the Bible “sin” does not mean something moral, but it denotes man’s need of redemption the state of the “natural man”, seen in the light of his divine destiny. Just as man can only be understood in the light of the divine Creation, so also sin can only be rightly understood in the light of the Christian revelation. Here too we must make a clear distinction between the fact itself and the light in which it is perceived. We can only see what sin is, what man is as sinner, in the light of the Christian revelation, which effects the transition from the state of “being-a-sinner” to that of “being redeemed”.—Emil Brunner, The Christian Doctrine of Creation and Redemption, 89

<idle musing>
Brunner says this quite a few times in this book. To him sin was not being in relationship with God through Christ. The rest is just the natural results of that lack of relationship. It's an interesting perspective—and in many ways I think he might be correct.
</idle musing>