No, but as you say, “Two cultures that live in different environments, facing different challenges – they will utilize different solutions to the same moral equation.” [bolding mine]
No, I have made no such assumption. You, however, seem to be arguing that two different societies can have different applications of the same “moral equation,” which can therefore lead to identical acts being moral in one society and immoral in another. Is this not true? If I understand your argument correctly, your theory allows that infanticide, for example, can be considered “moral” in one society and “immoral” in another society if those two societies live in different environments and face different challenges.
Again, define what you mean and do not mean by “fundamentally different situations”. Are you saying that your theory of evolutionary determined absolute morality would prohibit infanticide, say, in all cases? Or are you saying that one society might have a “fundamentally different situation” in which infanticide would be justified? To a traditional subscriber to “absolute morality,” infanticide is infanticide, regardless of who performs it, or where, or why. You seem to be saying, however, that an identical act can be considered moral in one society and immoral in another, as long as the circumstances used to justify that act are “funadamentally different” in each society. Is this not true? Does your theory allow that infanticide can be considered “moral” in one society and “immoral” in another society?
Play semantic games all you want. The fact is that you are not describing a form of “moral absolutism” as the term is commonly understood (although, to be fair, neither are you arguing for a radical form of moral relativism wherein every moral system is equally valid). Both of us are describing a form of moral relativism wherein there are generally applicable fundamental principles that can be applied in different ways to the same situations depending on the unique circumstances of each society. The difference between us is that you believe that these “fundamental principles” derive from evolution, whereas I believe they derive from man’s inherent capacity of logic and reason.
Barry