Morality, at its base, is centered upon the happiness or suffering of sentient beings and the realization that some actions are more conducive to ones own and others happiness or suffering. Actions and behavior can be deemed either ethical or unethical due to the natural consequences which they necessarily produce.
Moral relativism is an absurd obfuscation of this reality not to mention absolutely hostile to a true moral calculus. Moral relativism is, essentially, the ideology that all forms of morality are the product of culture and of society, which they are, but further that there is no foundation for which to measure the justification thereof, hence all morality is equally viable. At the heart of this ideology is a rather obvious contradiction: the claim that all forms of morality are equally viable, that all forms of morality should be respected, this is not a relative but an absolute claim and one which certainly runs into trouble when a cultures morality consists of negating other forms of morality; for if all forms of morality are true and one form of morality claims that all other forms are untrue then a conundrum is created for the relativist. Furthermore moral relativism neglects the science of humanity, psychology, wherein we learn that there is a human nature characteristic of the human species. What I find most repulsive in moral relativism is the notion that because it is the custom of a specific culture to degrade and devalue their women and allow what is essentially rape that this is permissible because it is their agreed upon morality. These relativists are either ignorant of or hostile to the reality that all women, all human beings for that matter, respond to rape and degradation negatively, the effects of rape and degradation of human beings is equally nefarious across the human spectrum regardless of ones specific culture. Moral relativism is the product of a perverse philosophy, which, in many ways, compares to nihilism.
Worse than the moral relativist is the religious moral absolutist who has received a morality from an alleged supernatural source. With religion one usually finds morality stood on its head, one finds a false morality, immorality. What many religions do with morality is separate questions of morality from true questions of happiness or suffering, they present hysterically absurd falsifications of morality, many of which are utterly immoral. Within the bible, both old testament and new, it is a moral proposition, commanded by god, that homosexuality is an abomination and carries with it the penalty of death. This moral proposition is a clear falsification of morality, there is no discernable suffering, homosexuality does not harm other people, it does not cause others to suffer and despite what fundamentalists claim homosexuality does not destroy “natural” families. However this moral proposition does cause suffering, it causes and justifies the degradation of homosexuals, it goes even further, it calls for the mistreatment of homosexuals, it calls for immorality. Religious morality is replete with such falsifications, such immorality, within its set of moral propositions; what a euphemism, what a true blasphemy, it is to even use the term morality in such an instance.
Whenever you hear the name “god” mentioned within the same breath as morality rest assure it stands for either a vacuous and superfluous platitude or the name by which one justifies the perversion of a true moral calculus.