Demon in Buddhism and Taoism

What kind of test does a sinner with both human and demon blood have to endure in order to survive in this continent where humans and demons are incompatible with each other? In this terrible world, how can we distinguish between good and evil, right and wrong? Eventually, people will discover that this world! Don't talk about right or wrong, just win or lose! If I were a demon, what would Buddha do to me? If I become a Buddha, there will be no demons in the world!