Can Creator create morality from nothing?

[twocompulsive]

twocompulsive...I think you misunderstood my argument. I'm not trying to prove if God exists, then morality is objective/absolute. I'm rather stating, if morality is objective, then it's eternal. The argument relies on "If God were to exist, he cannot create objective morality" and "Morality is objective" to prove this. The conclusion seems to follow, from these two premises...that morality is eternal.

You can also substitute "goodness" and "greatness" as neither of these two can be arbitrary as well. And if you assume that there is infinite potential to these, and are eternal, you will reach conclusion of God.

This argument is a long proof of the famous premise: "If there is objective morality, then God exists." or "If God doesn't exist, then there is no objective morality".

Right, well then in that case I would say no, because I do not believe in objective morality but that has nothing to do with me not believing in God. I do not believe the two are mutually compatible. It is perfectly possible for example to have a debate about one without invoking the other. So I therefore challenge the very assumption you are basing your argument on. Whether you believe in God or not or whether you believe in absolute morality or not, the root of morality per se lies within psychology and not relgion anyway. So I think your entire premise is flawed from the start.