I believe the fundamental idea here is that in order to bring a concept to a group of people, you must convince them somehow. In our society convincing people requires reasonable proof with existential import; proof based on observation of the world. This is called evidence. All of the scientific theories have evidence to support them. But the idea of a theory, as Calimero mentioned, is a model that best fits gathered evidence, or behaviors. "Bests fits" means that it is not 100% correct, and thus is wrong.
So, I have a simple question: How can we have all of this evidence for scientific theories and have them still be wrong, yet people come about with very little or no evidence for mythology and claim it's truth?
So, I have a simple question: How can we have all of this evidence for scientific theories and have them still be wrong, yet people come about with very little or no evidence for mythology and claim it's truth?