Now, I want to point out right away that that’s a strange claim to make, because usually, the phrase “OBJECTIVE moral value” means something like “moral value grounded in something beyond the attitudes of a person or persons.” Right? If what you’re calling “moral value” is just based off somebody’s personal attitudes, that’s called SUBJECTIVE morality.
I've seen this from you a couple of times, and despite it being answered even by fellow athesits it seems you still think it's a pretty strong objection.
Here are the issues. 1) It's a straw man. Theists, at least those who hold to the divine command theory you're attempting to critique, don't think that moral values are based in the attitudes of God, but in His very nature. His attitudes toward behavior flow from this essential part of His being. So you misled this audience.
2) It doesn't destroy the objective nature of the moral values that we are defending. These morals exist in spite of what anyone thinks, what anyone desires, what makes anyone happy, etc. All people are bound by them and all people will be judged by them in light of being made in the image of God. Innately, all people whose mental faculties are functioning properly apprehend these morals even if they don't believe in God; hence the common belief that some things are really wrong.
3)Who says that the well being of conscious creatures is a good thing; good enough to base our concept of morality off of? People all around the world would debate your assertions about "whether legalized abortion promotes the well-being of conscious creatures. There’s an objective fact of the world about whether or not female genital mutilation promotes the well-being of conscious creatures." What are you basing these personal opinions of yours on, Luke? Do you realize that the Muslim cultures that practice the latter are far outpacing the western nations that cringe at this practice in spreading their genetic code? Further, they would say it does produce the well being of those in their society because it keeps the women in line. You're just assuming your western ideals, fostered in a Christian context, are the thing that is the best for people. But the Mullah in Pakistan is going to ask, "who the heck are you?"
Even if the Nazis had won World War II and brainwashed everybody into thinking that killing people who aren’t white Europeans is okay, it would still be an objective fact that killing non-white people would NOT generally promote the well-being of conscious creatures. That would still be an objective fact.
The Nazi's thought it would, and that's why they acted on it. They thought the well being of humanity hinged on eliminating the Jews. Those who owned slaves and subjugated the rights of women thought that advanced the good of conscious creatures. It's subject to the prevailing perception of what is beneficial for conscious creatures. That isn't objective at all, Luke.
Further, who grounds the assertion that the well being of conscious creatures is worth promoting. Who says? What do conscious creatures have over non-conscious creatures? That sounds like specie-ism.
4) We do science? To discover morality? Really? Science can't tell us what actually should be considered a benefit to conscious creatures, because that is a personal opinion dependent on individual notions of what is beneficial. And that is just an arbitrary definition anyway. Does the moral fact that "we should advance the well being of conscious creatures" have some basis beyond the human mind? If not, it's subject to those human beings who think that way. There isn't actually a moral code that is objectively true and binding for all people, rather your formulation here is just as subjective as any other secular moral theory.