It's not our limited lifespan but rather our limited knowledge and understanding. If God is immortal and lives in a realm that has no death and God is all knowing and the creator of this worldly realm we live in then He must be on another level that we cannot apply our understanding of morality too. He is not a subject like us but the creator of the subject. He does not have a moral opinion because he is morality that we are trying to understanding and find truth with.
Again, why does God's immortality have any bearing on his morality?
This is a separate argument for moral objectivity. The objective moral argument is that just like science where we can find objective truths regardless of peoples personal opinions of them we can find moral objective truths regardless of peoples opinion.
This doesn't explain why we should conclude there is a "law giver" when we have a law of nature. I suspect that it's because we assume that a law of nature is like a law of government, however, that is not a justifiable comparison.
For example you implicitly expect people to be honest in debates and not misrepresent your arguments just like the ones you are putting forward. So we could say that honesty in debates is a necessary requirement just like any point on the circumference of a circle is the same distance from the centre of that circle.
Someone may argue that it is not the same distance but in attempting to measure it finds the fact it is. Just like someone may argue that honesty is not needed to have a coherent debate and then finds when honesty is taken out of the equation things become incoherent.
Are you suggesting that I am bering dishonest in this discussion?
The idea that if there are objective moral values then there must be a moral lawgiver is a separate but also supportive one to proving there is objective morality. But one not needed to prove objective morality.
But one could say that just like there needs to be a moral lawgiver because morals are objective (outside the subject humans). A similar logic can be used for mathematical facts. Having mathematical equations being so perfectly aligned in equations including in the universe would imply there is intelligence behind the universe and world.
Since I believe morality to be subjective that there needs to be someone who sets what we consider to be morally good and bad. And this is quite unlike the need for a lawgiver for the laws of nature such as gravity, since those laws are inherent properties of the universe, not decfrees handed down by some higher-ranked entity.
However, I don't see why we should conclude there is some external moral lawgiver just because most people have a great deal of agreement of what is morally good and what is morally bad. I think that it's perfectly plausible that we create our own morality, and the similarities between my moralityy and my neighboiurs stem from the fact that we both live in the same society. Morality is a social construct.
If you really understand them they are pretty powerful as with the above logic.
I don't see how.
As mentioned there are certain moral values that stand independent of personal opinion.
You haven';t shown this to be the case.
A person may have their own opinion but it can be proven they are morally wrong.
No it can't. I suspect that you will try to show an example using an extreme case, such as rape or murder. However, if you can show that morality is objective, then it should work for
ANY case, not just the extreme ones. So, can you show me, objectively, that it is right or wrong to smack a disobedient child?
Honesty as a moral value in debates is one example. There are moral values in lived experience we cannot deny. Despite people claiming their personal view and that there are no objective morals they cannot help but acknowledge the moral truth in lived experience.
Of course, lived experience is a completely subjective thing, so I don't see how you can use that to support your claim that there is any objective morality.