Question for Evolutionists #6, Living things look like they were designed, so how do evolutionists know that they were not designed?

Richard Dawkins wrote, “biology is the study of complicated things that have the appearance of having been designed with a purpose.” Francis Crick, the co-discoverer of the double helix structure of DNA, wrote, “Biologists must constantly keep in mind that what they see was not designed, but rather evolved.” The problem for evolutionists is that living things show too much design. Who objects when an archaeologist says that pottery points to human design? Yet if someone attributes the design in living things to a designer, that is not acceptable. Why should science be restricted to naturalistic causes rather than logical causes?

 http://creation.com/refuting-evolution-chapter-9-is-the-design-explanation-legitimate
 http://creation.com/genesis-unleashed?fileID=OVm8lSFjaa8