We're back to where we started.
Yeah, but could you possibly answer my questions first?
How can you be "good" without the definition of good?
Then define it.
It appears as though your definition of "good" is "whatever the creator intended".
This is not only an arbitrary definition, it is also as good or bad as any, and on top (even if we´d accept it for the sake of the argument) it leaves us with a bunch of epistemological problems (so far we haven´t even established that or which God exists, and we haven´t established an epistemology for determining what this God´s purpose is, and so on and so forth).
If God doesn't exist, then where does "goodness" come from?
Probably where everything "comes from" - I have no idea where everything "comes from" nor whether the question "Where does it come from?" is even a meaningful question (seeing how it necessarily leads to an infinite regress).
And, of course, if God doesn't exist, then ultimately it's just your opinion as to what's good and what isn't.
It´s my (or your) opinion regardless whether a God exists or not. If a God exists, we have just have a divine opinion, besides our human opinions.
And frankly, when it comes to matters of humans interacting with each other I care about human opinions way more than about a potential creator´s opinion. I don´t know his motives, I don´t know his purposes. They could be good, they could be evil, or anything in between. And, of course, the potential creator´s opinion or purpose isn´t by any stretch of the word "objective". It´s the creator´s subjective opinion or purpose.
And your opinion is cosmically irrelevant, as is everyone else's.
When you asked about persons being "good", you didn´t notify me that you were thinking of "cosmic" dimensions.
If there´s no God, there´s no God given purpose. I´ll give you that - but that´s as trivial as it is almost tautological.
So ultimately it makes absolutely no difference what you do or don't do.
"Ultimately" - again, you didn´t notify me that you meant to deal in such categories. Anyway, "ultimate" is depending on the scenario, and in the absence of a God "ultimately" can´t mean "by God´s standards".
Right, but it's the opinion of someone who is in a position to know much more than anyone else (you [and others] keep ignoring this fact). Just like a car mechanic's opinion about your car is "just an opinion" - but it's an opinion you would obviously value over say, the opinion of a cashier at Kroger.
Depends on what this opinion is about. If it´s about car related facts, then yes. If it´s about moral questions, values etc. then no.
Then it ultimately has no meaning whatsoever.
Again, if you meant to ask about "ultimately", you should have said so upfront, along with defining your personal understanding of what´s "ultimate".
However, you asked about plain "good" - not "ultimate good" (however you may define this term in order to make your standard appear "ultimate").
I answered accordingly, and, frankly, I do not care on bit about supposedly "ultimate standards" of a potentially existing God. Morality, in my understanding, is meant to improve the interaction among humans - and a God´s opinion is as irrelevant as it gets, in this field.
So let´s assume, for argument´s sake, assume that there is a God who approves of rape, genocide and the deliberate killing of people. In your argument, this would be "ultimately good" - because it would serve whatever purpose this God had in mind for his creation. Whereas I say: "Why care about this 'ultimate good'?".