But in what sense would objective morality exist?
Let's consider the speed of light as per your example. You can say it exists because it describes how the light, which we both agree to objectively exist (right?), behaves.
(This is presuming we accept that rules of physics in themselves objectively exist.)
Let's say one objective moral rule is that rape is moral. This moral rule describes the behavior of what? Nothing. Objective moral rules are therefore completely unlike physics rules.
The point is that the standards for classification of an action as moral/immoral objectively exist.
In the game Red Dead Redemption 2 you have a good/evil meter that is based on your actions. The game mechanics continually judge your actions and give you an overall rating.
Do you believe this objectively exists? Would it objectively exist if it was in the code but not visible to players?
For me the answer is yes. If you disagree, why?
If a $60 video game can implement such a thing, why couldn't an all powerful God?
But that's the thing: I don't need to leave the system to create a new lottery.
Yes you do, this is the error in reasoning you've been making since the beginning.
You cannot create a new lottery within the existing lottery just by deciding you want to. You have to start a new lottery. which is external to the existing one.
A new lottery is a new system, just like you would need to create a new chess organisation if you wanted the king to move 5 places or a new football organisation if you wanted all players to be able to use their hands, which is why Rugby, NFL, etc are not. run by FIFA. despite all being 'football'.
Imagine for example the first person to create a lottery declared that his is the only lottery that can exist. His statement would only be meaningful if he were to enforce it effectively.
The God can enforce it by sending good people to heaven and bad people to hell.
Could God control the minds of everyone in a way that no one would abide by a moral system distinct from the one he originally devised? Yes. But we don't live in that universe. Would you count the only moral system that exists as being objective morality?
It's not about the universe we live in, I don't believe in God. It is about a universe that could hypothetically exist where everything was created according to a plan by an all powerful God.
But the only one that exists would be objective.
But it wouldn't take all people believing in it to make it objective. All it requires is an external standard for judging morality that treats each person the same and produces definitive outcomes based on this, as in the game Red Dead Redemption.
I don't agree with the morality in the game. Saying hello to enough people will make you good even if you murder dozens, but in the game this makes no difference. I kill people then say hello a lot if I want to have fun and get the good outcome.
It is the only moral system that exists in the closed system of the game, but not one I apply in real life when I exit that system.
If I did not exist outside of the game though, it would be the only one that matters regardless of my thoughts.
But is the existence of a judging mechanic equal to the existence of an objective morality?
In a closed system, yes.
What morality is is defined by the creator of the system. Just as chess rules are created by FIDE or football rules by FIFA.