They just know that it exists. This approach solves nothing, it answers no questions, and provides no common thread of organization or purpose in the world. If we start with an evolutionary framework, use it to interpret the findings of different areas of science, and then claim these interpretations to prove evolution, we are guilty of circular reasoning. You are going in the wrong direction. Evolution doesn't create or support evidence.
Evidence supports the theory of evolution.
Any theory is an explanation for a set of observations and data and provides predictions for the results of future observations and experimentation. If those results are consistent with the predictions, the theory survives. If they are not, the theory fails. Data stands alone independently of theory. The most that can be said is that this evidence is not glaringly inconsistent with the theory of evolution, something that creationists can also claim regarding their ideas.