Evolution has no specific goal. Radiometric and other analyses have been developed which permit the accurate dating of rock samples. A scientific theory is a widely accepted belief, solidly based on evidence. The scientific method is self-correcting. Scientists' understanding of evolution and its processes change as new evidence become available.
Evolution plays a central, unifying role in our understanding of nature.
A study of evolution leads to new concepts for useful research. That is, their supporters cannot accept the possibility that their fundamental beliefs are false. Supporters of creation science tend to start with a fixed belief system derived from a religious text, and attempt to support that belief by searching for compatible evidence. Non-scientific beliefs should not be taught in the science classroom. That law only applies to isolated systems.