Evolution, creationism, fact, theory
This is a comment to a post in Crystal Clear
Here is a nice definition of theory
Theory: A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested OR is widely accepted and can be used to make predictions about natural phenomena.
So evolution is a theory since it is widely accepted and can be used to make predictions about natural phenomena.
Theory and fact are not mutually exclusive. Gravity is a theory, relativity is a theory.
In the case of evolution the fossil evidence show that species change and new ones are developed with time. So an association can be established. The association is between change in species and change in time. We can arrive to conclusions here in the same way we arrive to a conclusion from a retrospective study in medicine, i.e., establishing associations. Certain associations are powerful enough to accept a cause-effect relationship, i.e. change in time leads to change in species (there is no way that a change in species will lead to a change in time). How do you think we arrived to the conclusion of which antibiotics are best for pneumonia? Retrospective studies did it because ethical concerns made prospective studies impossible. In the same way, evolution cannot be proven prospectively due to lack of time.
Creationism is a belief, based on faith. There is no science there. It belongs to the territory of religion so it should not be included in school textbooks. Anyone is entitled to believe in creationism, even scientists if they wish.