I’ve come to the conclusion that the term “good” and others like it are inherently subjective, due to their meaning. What does it mean for something to be good? As I understand it, something is good if it supports, improves, enhances, or betters ‘something’. The “something” in the definition makes the term inherently sujective. As has already been suggested, to a fly a pile of crap is good; to a chef, not so much. I further propose that once you take the fly and the chef out of the equation, you actually deprive the word “good” of meaning, since you’ve deprived it of the context upon which it relies.
Now, to examine that all-powerful god and his relation to “good”. The god could, for example, declare that pile of crap to be “good”. What would this mean? I can see three possible cases:
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He’s declaring it in his own, subjective opinion. The chef still doesn’t like the crap, of course. In this case, there is still no “objective good”.
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He declares that the pile of crap is objectively good; therefore, by definition, it’s good for everyone. The chef now likes the pile of crap. This clearly hasn’t happened; everybody doesn’t agree on everything (or on anything, really).
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He declares that the pile of crap is objectively good; therefore, by definition, it’s good for everyone, but the chef doesn’t notice, because he’s a moron or otherwise defective. You think you don’t like the taste of crap? Nonsense, you actually like it, eat up.
To some limited degree, case 3 sounds reasonable; sometimes people really don’t seem to know what’s good for them. However in actuality case three is nothing more than assuming that everyone who disagrees with you is an idiot, unable at any level to ascertain what is good or valuable. This is a repulsively selfish and egotistical position, despite being a central concept behind certain churches.
Aside from being repulsive, the problem with this position is that defining an objective good does not ‘undefine’ subjective good. God may declare waterfalls or piles of crap to be sublime, but that (demonstrably) doesn’t mean that everyone else agrees. Meaning that for everyone who might disagree, a thing has two different “good” values: the subjective opinion and the “objective” opinion. This couldn’t happen if the “objective” opinion was truly objective; therefore, by definition the “objective” opinion is just another subjective opinon, distinguished only by the fact that it’s held by someone repulsively selfish and egotistical. Case 3 is therefore just case 1 all over again: there is thus no such thing as an actual objective good.