When you assert that there is such a thing as evil, you must assume there is such a thing as good.
When you say there is such a thing as good, you must assume there is a moral law by which to distinguish between good and evil. There must be some standard by which to determine what is good and what is evil.
When you assume a moral law, you must posit a moral lawgiver -- the source of the moral law. …
[A] moral affirmation cannot remain an abstraction. The person who moralizes assumes intrinsic worth in himself or herself and transfers intrinsic worth to the life of another, and thus he or she considers that life worth of protection (as in the illustrations [Sam] Harris gives, namely, rape, torture, murder, and natural catastrophes). Transcending value must come from a person of transcending. But in a world in which matter alone exists there can be no intrinsic worth. Let me put it in philosophical terms:
*Objective moral values exist only if God exists.
*Objective moral values do exist (a point Harris concedes…).
*Therefore God exists.
Ravi Zacharias, The End of Reason, pg. 55-56