Curious about Hinduism's claim on morality vis à vis religion

While reading a book titled "Moral Literacy, Or, How to Do the Right Thing" by Colin McGinn, I came across this series of statements: "A less abstract preliminary question concerns morality and religion. Although I won't be appealing to divine revelation or command in this book, I don't intend my conclusions to be anti-religious. Rather, I mean to be neutral on religious questions, in the sense that both theists and atheists will be addressed. But I should state what I take the relation between morality and religion to be. Many people believe that morality has its basis in God's command. They think that God decides what is right and what is wrong thereby making morality be what it is. They also believe, or fear, that without God morality could have no basis or justification. This position has a superficial appeal, but it is decisively refuted by an argument that goes back to Plato. The argument is very simple; and it shows that genuine moral rules could not be created by God's will. First, ask whether God could make what we now think is wrong right. Could He, by divine command, decide that murder is right after all, thus making it right from now on? This seems an odd question: how can you make something that was wrong right just by declaring it to be so? It is like making something false true just by saying that it is true. God can't do that, and if He could we would have every reason to distrust His edicts. How can we respect God's moral law if it represents nothing but His arbitrary whim? So presumably God can't just invent goodness by brute assertion; rather, we must assume, His nature is to decree what is good - independently of His decreeing it to be so. But then God doesn't literally make things good; He simply recognizes that certain things are good and then judges us according to our conformity to this. God judges that a murderer did something wrong because murder is wrong and God (being omniscient) knows that; it is not that murder gets to be wrong because God happens to judge that it is. Even God couldn't make murder right simply by judging it to be so. So God's decrees are not the ultimate source of moral truth; they are the recognition of a prior moral reality - which is, indeed, why His decrees should be respected. To put it differently: even if there were no God murder would still be wrong; adding God to the picture can't change this moral fact. So atheists (like myself) have no good excuse for refusing to take morality seriously." So, how would a Hindu who believes morality has its basis in Śruti react to this line of reasoning?