The moral argument has, for all its intricacies, an immediate existential bite. If objective moral truths bear witness to the existence of a good God as their source, we are then put in the dock before God. Our consciences reveal both a transcendent goodness and our own violation of this goodness through our pettiness, theft, cruelty, dishonesty, lust and a hundred other minor and major infractions. C. S. Lewis ends his moral argument for God in Mere Christianity by alerting the reader that Christianity has nothing to say to people “who do not know they have done anything to repent of and who do not feel that they need any forgiveness.”
It is after you have realized that there is a Moral Law and a Power behind the law, and that you have broken that law and put yourself wrong with that Power—it is after all this, and not a moment sooner, that Christianity begins to talk.