From -->http://www.nps.gov/badl/newspaper/03Preamble.pdf
"Many cultures have their own unique story on how the earth was created. Scientists use fossils to interpret earth history and plant and animal evolution. These scientific concepts often conflict with many creation beliefs. The study of fossils and evolution is not a belief system. It is a scientific theory of what we observe in the natural world.
The National Park Service provides interpretation of paleontological resources based solely on current evolutionary theory because we are obligated by the First Amendment to the Constitution against promoting a particular religious view. "
Theories are the 'scientific' way of stating: "We BELIEVE thus......"
(are NOT conclusions made?)