They are cohabitants in this existence. Facts, evidence, repitition, duplication. Based on the faith that this process will reward the observer, fufill the repeater, enlarge the existence of the fact finder. It is a faith in the method to produce a result time and time again that allows scientists to hypothesize. What is a hypothesis? A tentative insight into the natural world. Sounds to me like it requires a whole lot of faith to make something so delicate as a "tentative" insight.