This question poses a dilemma to Christians regarding how they may base their morality in their god. On the one hand if their god must command what is good, then not only is he limited in that he must adhere to moral standards beyond his will, but he is not needed for morality. All one must do to know what is moral is to look to those moral standards, and any god is irrelevant.Is what is morally good commanded by God because it is morally good, or is it morally good because it is commanded by God?
On the other hand, if morality is simply what the Christian god commands, then morality reduces to "my god said so, and that's that." If the Christian god commands men to rape their mothers, then they must do so, and doing so would then be "moral"!
It should come as no surprise that Christian apologists have resolved the Euthyphro Dilemma, or so they believe. A common way of slipping out of this sticky situation is for apologists to simply say that God commands what is good because he is good! His very nature is moral, and therefore what he commands is moral. Problem solved.
Question for Debate: Have apologists adequately resolved the Euthyphro Dilemma?
I don't think so. Note that the "solution" to this problem involves saying that the Christian god is "good" and "moral." Apologists are unwittingly comparing their god to some standard of goodness. In doing so they demonstrate that the Christian god must live up to this standard of goodness to be moral, and he is not needed to know what is moral.