I would have to agree with your assessment...
OK, great, then it seems to me that it then also follows that evil without an attached deity, is the same process of turning supernatural agents into abstract forces.
Since abstract forces are created to replace supernatural agents it is therefore correct to suspect they reside on the same shaky wish thinking evidence and most probably don't exist.
If these things are true then it is also true that both good and evil therefore do not exist as either actual material objects or abstract forces.
If good or evil do not exist as either actual material objects or abstract forces then it cannot be said that something is composed of them nor contain their forces; therefore nothing can be intrinsically good or evil.
If all this is true, yet still a thing can be said to be good or evil and that assesement can seem like an axiom, therefore the words good and evil must have different meanings, when used as axioms, then to imply intrinsic good or evil or an infusion of good or evil, that is, if the usage of the words is going to have any real practical meaning.
So if the words good and evil are axioms but don't mean supernatural agents or abstract forces then they must be synonyms for something else.
It follows then that good and evil are axioms for favourable and unfavourable; since it is true that something good is favourable and something evil is unfavourable.
Therefore the term good means something favourable and the term evil means something unfavourable.
Favourable and unfavourable both imply an object of their favour. It is reasonable therefore to think that an object would desire good (favourable) things but dislike evil (unfavourable) things.
The desire of an object can rightly be described as an abstract force generated within an object and manifested by that objects actions only if that object is capable of desire.
So good is actually acting on the desire for something favourable and evil is the opposite.
But acting on implies that another object is being acted on therefore good and evil require the interactions of two objects: that which desires and that which that desire is acted upon.
The definition of good and evil thus far hold so long as the second object isn't capable of desire.
If the second object is capable of desire then the definition so far can be conflicted therefore the definition must be expanded.
It is possible for one object to desire and the other to not and both are objects to each other. In this case there is both good and evil therefore if acted upon the abstract force of good or evil could manifest. If both objects act then both abstract forces of good and evil could manifest.
The interactions of these two objects can themselves be seen as an object now and thus the source of good or evil (or both), however, this would require a third object to witness the interaction of the first object.
If the first object is favourable to the second then it could be said to be good. If it isn't favourable then it could be said to be evil. However this still allows for some conflict as one of the objects in the first object could still find something unfavourable (and thus evil).
All three objects could be seen as a single object by yet another observer and again the outcome of good or evil would depend on that object. Then again a fifth, sixth, seventh object could observe an ever increasing object and so into infinitum.
At any point an object could say the other is evil (unfavourable) or good (favourable) and therefore the determination of good or evil resides with the object and its interpretation favourably or unfavourably of what it observes.
It therefore seems likely that a general determination of good and evil can only be derived at by consensus.
Consensus requires time and also the real judgement of something being favourable or unfavourable requires time; therefore something may seem good for a period to a smaller object, which in time and as the object grows, may become less so and even turn out to be evil by consensus.
So in the case of the Holocaust: it was good to Hitler and then to Germany but when the world found out it was determined to be evil: yet the entire time it was evil to the Jews.
I would argue that always if someone thinks something is evil then it is but this is because I am an anarchist and hold liberty as the most supreme maxim.