All morals are subjective, ultimately, so the question is somewhat moot. I say this on several points. First, morals are totally dependent on the mind in evaluating whether certain actions and intentions are right or wrong. (Some are neither and are just amoral.) Morality is an abstract concept of the mind, and does not exist independent of it. That is not to say morals do not exist. Morality is profound and important, just as beauty, love, and empathy exist. But none of these are "things" in and of themselves. Thus, the do not have an objective status.
Second, simply pointing to the willed morals of God does not make such objective in any sense for several reasons. For example, look at all the christians who point to the exact same bible as the moral justification for supporting or opposing the death penalty. Who is right? At least one side must necessarily be using their own subjective notions of morality and imputing onto the bible, but who? Add to this the multitude of other issues in controversy, from war to abortion, and this becomes all the more evident. Furthermore, the act of choosing what version God to believe in necessarily invokes one's subjective determinations. And even if you were able to strip all this away and get to God's actual morals, those morals are subjective to God, and you are just adoptiing someone else's subjectivity.
Thus, from a practical and philosophical perspective, morals are ultimately subjective. Now, that is not to say we cannot find good reasons for establishing certain codes of moral conduct. The prohibitions on murder, theft and violence against others all have many rational reasons behind them. The virtues of love, forgiveness and telling the truth are self evident. The success of societies is often directly related to their collective, institutional morals. But this only recognizes commonality of thought by convention and does not elevate the morals themselves to objective status, even though the effects of different morals can be evaluted by their objective consequences.
I mean, let's be honest, if you suddenly discovered there were no god, would you run out and kill, rape, steal and lie as much as possible? Of course not. The fact that non-christians are just as moral as christians by any measurement is powerful evidence that abiding by a particular religious principle is not the only true source of morality. Otherwise, those who have no idea of Jesus could not be moral. But they are. And the idea that God imputes a sense of morality in all people, known as a concience, to get around this quandry is absurd. If this were the case, sociopaths would not logically exist.
So when people give advice on morals, it is always subjective, ultimately.