In general it does appear that there is a universal sense of morality in the Golden Rule.
And that may very well be partially instinctual and partially sociologically based. All animals have certain predilections and behaviors based on deeply ingrained instincts. Humans have an incentive to be kind to one another.
Its about as helpful as pointing out that canine behavior is pretty consistent... among other canines.
Even supposing morals are absolute, we have no way of knowing which morals are absolute and which are relative. Case in point, ISIS thinks that an execution is not murder and is in fact retributive justice. To other people its cold blooded murder. No consistency.
Even supposing morals were absolute there's no way to confirm where it comes from. Who is the source? Lots of people and different religions claim moral absolution that often contradict one another.... so how do you determine which is the real absolute moral?
"Reason obeys itself; and ignorance submits to whatever is dictated to it" -- Thomas Paine