What is Sin?
In order to effectively deal with an enemy, it is of utmost importance to be thoroughly and accurately briefed on the qualities and characteristics of the foe. That sin is the deadliest of all foes need hardly be debated. With the defeat and elimination of sin, the cessation of war, crime and cruelty would necessarily follow.
Christianity now has to preach the diagnosis, in itself very bad news, before it can win a hearing for the cure, … a recovery of the old sense of sin is essential. C. S. Lewis, The Problem of Pain, Macmillan, pp. 55, 57
As long as sin remains an elusive, undefined phantom it is no surprise that its victories over humanity continue to escalate.