That was a reply to PostmodernProphet who said that I have no values.
Which is why we simply lack the belief that gods exist. I also lack the belief that fairies exists.
The variety comes from different environments. In some environments, being able to fly helps survival and replication. In other environments, being able to breath under water is more important. It also depends which other species are around. After the dinosaurs died out, other species that wouldn't have been able to survive were suddenly able to survive and replicate.
But these theories are based on evidence, while religion is not. Every theory requires some faith, but religious theories require blind faith.