"Morals"/morality are evolved. They are a consequence of living in sophisticated societies, itself dictated by our evolutionary biology. There is an evolutionary advantage to living in complex groups, and complex groups require a set of behavioural rules to function. Ergo, "morals" evolved.
It is your view that morals evolved (via the mechanism of evolution) to enhance the survival prospects of a species, amirite?.
This would appear a logical argument and I can empathise with you on how you reached this conclusion.
This theory would indeed explain many things. Like for example, how we see murder as inherently wrong, because we are reducing the size of the reproductive gene pool and numbers of individuals who will gain the chance to mate. Likewise acts like rape could be condemned because it might be shown that the species reproduces more effectively through a means where individuals partner for life (as seen in swans), for various reasons, including possibly that it provides a greater incentive for parents to care for their own offspring and that it diversifies the gene pool by allowing the maximum number of individuals to mate. This is in contrast to the other systems such as that which occurs in packs of wild cats like lions where only the “alpha” male is allowed to reproduce and all other members care for his offspring.
Morals under this explanation fail to deal with some issues, like for example explaining what is wrong with stealing, or lying (IDK perhaps they can?) but I will ignore this for the time being.
If morals developed as and are a means to advance the survival of a species than how is it that today, you see it morals as an argument to justify engaging in homosexual sex, or to justify the use of contraception or the practice of abortion? These are all contradictions to the suggested purpose morals play in our life.
Homosexual sex cannot lead to the creation of life and so it cannot be justified with morals (because they developed purely as a means to advance the species, according to you). Likewise contraception cannot be endorsed either. Abortion is the worst of the three, where despite life having been already created, it is destroyed before the individual is given independence from its mother and the chance to mature and ultimately reproduce itself. So under your description of a moral’s purpose (to increase chances of survival etc.) all three of these acts, homosexual sex, the use of contraception and abortion would be the pinnacle of all that is immoral?
Something which was apparently formed to promote the reproduction of a species cannot be used to justify acts which do not lead to the survival of that species, let alone acts which could be seen as inhibiting its survival (contraception/abortion etc.).
It has been mentioned that morals change. However if morals are a means to increase the likelihood of reproduction (as you suggest), since the human species still reproduces in the much the same manner as it did back in the “cavemen” era when morality was first developed, there is no need for morals, under this definition, to change, as they would otherwise continue to increase the species’ chances of survival.
Morals are not used for this purpose anymore, so, in the case of a Godless world, where they only developed as an evolutionary imperative (which hasn’t changed as humans reproduce in the same manner), does that make them redundant today if they are not used as such? Or is the biological imperative implanted in humans as it is all life suddenly less important to us now than our justification of activities which merely distract us from our original and only biological purpose, the only justification in a Godless universe as to why we exist in the first place (reproduction above everything else).
Now it would make no sense for morals to change at all because in a Godless universe, a human is simply another life form and has no greater importance than any other animal, plant or bacteria. Like all other life, our only purpose would be the continuation of our own species at the expense of all others. An atheist may believe they can live a selfless life without believing in God but this is not true, for if God did not exist, they’re only purpose in life is the biological imperative to reproduce and continue the species, this is a basic evolutionary premise, involving the success of the “strong” and failure of the “weak” to do so.
This primitive biological goal is something that is not achieved through self-sacrifice and the supporting of others beyond what is necessary for the species to continue (e.g. sharing food, hunting in pack etc.) which therefore renders such acts meaningless. Animals do not have time for hobbies or to chase their desires, they exist to live and reproduce, and this is the sole goal to which all their efforts are ultimately directed. Animals do not willingly sacrifice themselves for the preservation of others in their own species and are not even aware of the concept. Likewise, humans wouldn’t be able to grasp the concept either (as the thoughts of the individual are only concerned with himself reproduction as to fulfil their biological imperative), if their only purpose on Earth was to reproduce.
In light of this, I reach the conclusion that morals must represent something much more important to the human than what you suggest they are, an evolutionary adaptation to assist and promote reproduction.
I don’t pretend to be an expert on the science of evolution, but since the only source quoted as part of the argument behind it is Wikipedia, I’ll go out on a limb and make the assumption nobody else here is an “expert" either. That said, please correct me if I have made a mistake with your interpretation.
/Rant