William Craig Lane
For example, if we do think that objective moral values exist,
 then we  shall be led logically to the conclusion that God exists.  And could  anything be more obvious than that objective moral values 
do  exist?  There is no more reason to deny the objective reality of moral  values than the objective reality of the physical world.  The reasoning  of Ruse is at worst a text-book example of the genetic fallacy and at  best only proves that our subjective perception of objective moral  values has evolved.  But if moral values are gradually discovered, not  invented, then such a gradual and fallible apprehension of the moral  realm no more undermines the objective reality of that realm than our  gradual, fallible perception of the physical world undermines the  objectivity of that realm.  The fact is that we do apprehend objective  values, and we all know it.  Actions like rape, torture, child abuse,  and brutality are not just socially unacceptable behavior—they are moral  abominations.  As Ruse himself states, “The man who says that it is  morally acceptable to rape little children is just as mistaken as the  man who says, 2+2=5.”
13   By the same token, love, generosity, equality, and self-sacrifice are  really good.  People who fail to see this are just morally handicapped,  and there is no reason to allow their impaired vision to call into  question what we see clearly.
  Thus, the existence of objective moral  values serves to demonstrate the existence of God.