Rhetorically speaking

'What is sin?', I ask myself. It got me thinking. My line of reasoning is something like this:
Some early humans invent some imaginary and all-powerful being. Then they persuade others to believe in the same imaginary being. Eventually belief in this being becomes the norm. The people who invent this imaginary being write down all their prejudices and write these down on papyrus. These are then incorporated into stories where the subjects of these prejudices are punished by this imaginary being. Righteous people, therefore, are to have the same prejudices, and to see that transgressors are punished as demanded by the imaginary being. The righteous are simply being righteous, and are therefore not doing anything wrong. (By the way sheep are sheep, and are therefore blameless).
Sin is, therefore, just a word to describe something against which the righteous allow themselves to be prejudiced.