But are you asserting that good and evil are objective or not? If I find child murder evil, is this "choice" just as justified as "choosing" to find child murder good? If it is a matter of choice, and both are logically valid, how do you distinguish bad from good?
.....obviously you also cannot reason about this. You also are enslaved to original sin, just like an addiction. I certainly I already said more than 10 times that good and evil is a matter of opinion, so for you to ask again if it is fact, it means you are totally hooked on making good and evil into fact, because of the phony self confidence it provides to have factual certitude on what is good and evil.
I already said, the conclusion bad or good is arrived at by choosing. Expression of emotion with free will. This means there is no objective criteria for bad or good whatsoever. For a decision, one can judge it good, one can judge it evil, objectively it is still the exact selfsame decision with either judgement.
I like icecream, and I find murder disgusting. And if there is no emotional depth for some issue, then there is still civilization. One can just accept in one go all the judgements in the Quran as moral, or accept all the laws of a country as moral, even if one doesn't have much emotion with many of the judgements in the laws. One can also relate one opinion to another, support one opinion, with another opinion. etc. etc. etc. subjectivity is of course a very large issue.
Very practical, and beautiful, for accommodating subjectivity, is the concept of the soul. To have a reference for who somebody is as being the owner of all their decisions, throughout their life. To simply believe people have a soul, makes subjectivity much more efficient, and meaningful. Also useful is the concept of the heart choosing. Which refers to choosing with all emotions in a unified way. Spirit is the most generally applicable term, it can refer to the agency of any decision, regardless if it is the weather, or a human brain which is decided. Whenever there is a possibility in the future, which is made the present or not, then the word "spirit" may be used to refer to the agency of the decision. etc. etc. etc.