That is the moral argument.
http://www.allaboutphilosophy.org/moral-argument.htm
What you posted was Greg's response to an evolutionary counter offered against the argument.
Lots of apologists defend the MA against the claim that objective morality is best explained by the evolutionary process.
The argument itself says nothing of science.
Show me an apologist specifically arguing that because science can't explain it therefore God.
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.