I've never seen an apologist point to the concept of sin as an indication that God exists. But this is what Keller does in this chapter. He defines sin this way "not just the doing of bad things, but the making of good things into ultimate things. It is seeking to establish a sense of self by making something else more central to your significance, purpose, and happiness than your relationship to God."
Keller views the doctrine of sin as a hopeful thing. This sounds paradoxical, but his reasoning is as follows: We all seek to build our identity on something, whether it be our career, doing good, our children, fame, or something else. This can prove disastrous on several levels. If the something on which we build our identity collapses, say our career, we are left without a sense of self. We are left empty and desperate. We necessarily idolize that which gives us our worth, which leads to denigration and exclusion of whatever threatens our sacred god. For example, if our identity comes from our wealth, we feel superior to those who are not. Or, if our worth comes from our morality, we will look down on those we deem immoral. Keller says that even creation is evidence of sin and points to disease, natural disasters, and death itself as an indication that the world is suffering the consequences of the original sin.
Keller says that the concept of sin provides us all a way out of this suffering. The answer to sin lies in making God our ultimate thing. By putting God first and living for Him, we are centering our lives around the only one who can fulfill you and give your life an ultimate sense of worth that cannot be shaken.
I've never seen an apologist point to sin as an indication for God. I'd be interested in knowing if this has ever impacted anyone.
I think we have all seen or experienced the results when the foundation of our self esteem is shaken (whether through job loss, divorce, child disappointing us or something else). How do any of you who are reading this post address this issue, particularly if you are an atheist? Have you found a solution to the problem of self worth that is as effective as Keller maintains his to be?