Do we need moral guidance? Yes. Do we need moral “authorities”? No, and especially not the self-appointed moral experts who wrote the Bible and the Koran between 1300 and 2600 years ago. If you want instruction from antiquity I suggest you might find more humanity, intelligence and decency in one letter of Cicero, one dialogue of Plato or one chapter of Thucydides than Bible and Koran together.
Old, Geezer: Who is the authority on what is decent? Nobody is: we’ve had to work it out for ourselves as our brains, our consciousness and language developed. We’re pack animals and the rudiments of morality are in us of necessity, just as less desirable things like the fight for territory, social hierarchy and the inequable distribution of the rewards of co-operative effort are, too, trapped in our distant origins. But we are not meerkats or wolves; we have the ability to reflect on our evolutionary conditioning and to modify our behaviour. And that is why moral progress is possible. No incentive is required - just the knowledge that a world in which people treat each other decently is a better world for us to live in and for our children to inherit.