God is not left out of the moral issue, he provides all, unquestionable morality in his literal, perfect word, the Bible.
But God does not have answers to every decision. Do you agree?
So what are Christians to do? How do you they figure out which option is the moral decision if God did not dictate it? What they do is apply moral principles. Like what? Like their Golden Rule. And the Golden Rule is a moral principle that is objective, not subjective. Do you agree?
Here’s an explanation of moral objectivism by wikipedia: [It] is the meta-ethical position that some system of ethics, or a universal ethic, applies universally, that is, for “all similarly situated individuals”, regardless of culture, race, sex, religion, nationality, sexuality, or any other distinguishing feature.
Do you agree that today’s Christianity is consistent with that description?