Read the comments from user Emily Says Meow, and you will see comments from yours truly. This is not in any attempt to brag on my own debating skills because they suck like crazy (ad-hominems and everything), but I want you to see how one user attempts to demonstrates "God's objective moral standard" and then goes right down a predictable rabbit hole of showing how some Christians attempt to rationalize the immoral passages of the Old Testament. Either the moral standard is objective or it isn't... either murder is always morally wrong, or it isn't always morally wrong. The same applies for all other moral standards. Morality is relative... we as human beings can decide between right and wrong, but those decisions are not always unanimous and are subjectively applied, depending on the circumstances.
Okay, I'm done.