People have different individual morality, in terms of what they think is right and wrong, but that doesn't mean there isn't a type of absolute morality. There are actions that we could do that would increase total human happiness. Imagine that you are faced with a choice between feeding yourself and hungry people and just being an over-gluten. One choice increases the overall happiness of people and one just makes everyone miserable. So there is a type of absolute morality that is totally secular and independent of spirituality (which never seems to be that well defined.)


