Well if we don't like the pig example you're gonna hate this one.
Our sad lonely guy on his island goes and invents himself a God - who he prays to. His God makes demands of him with a moral perspective so he, for example, goes barefoot on every 9th day or forgoes freshwater during the period that sunlight illuminates his cave, or.......
Now he has a morality of his very own - and we can't argue that it is with another sentient creature as this is an entirely imaginary god.
Our sad lonely guy on his island goes and invents himself a God - who he prays to. His God makes demands of him with a moral perspective so he, for example, goes barefoot on every 9th day or forgoes freshwater during the period that sunlight illuminates his cave, or.......
Now he has a morality of his very own - and we can't argue that it is with another sentient creature as this is an entirely imaginary god.