Whether God wants to admit it or not, there actually is an absolute standard of morality that is the highest, and cannot be topped. Any volitional act that is good for self and/or society is moral, and any volitional act that is bad for self and/or society is immoral.
Why is this the highest possible standard? If everyone always did what was good for self and society, and no one ever did anything that was bad for self and/or society, the problems we see today would simply cease to exist. People getting old and dying? Someone would come up with the reason for this, and fix the problem. The economy is crap? Someone is going to create a huge company and create opportunities for millions in the process, and that company will always treat people fairly. The weather sucks? Someone is going to fix that problem, bringing tropical storms where droughts are and bringing dry spells in where it is soggy. Too many people? Someone is going to find a way to access, or perhaps even, create dimensions that were not there before. Pollution? Someone will find something to do with it that will create something that others need--and the landfills will start getting raided for raw materials.
Even the government would change. The leaders, if they always obeyed this simple standard, would never pass bad laws, and only pass laws that were necessary to fix actual problems without creating new ones. No one would ever try to usurp other countries--rather, they would get busy creating extra dimensions so there would be room for an infinite number of people. Tax bills would plummet, since there would be no stupid regulators (the regulators would only be reviewing products and honestly informing people of what they find, so the customers could be the ultimate regulators).
So simple, yet most people think morality needs to be so complicated. Thanks a bunch, Plato, for complicating such a simple thing by declaring that mankind is inherently evil and wicked. And, thanks to the religions for adding to the complication, making it almost impossible for an adult to realize that morality is inherently so simple that small children naturally practice it.