Based on the writings of John Gribbin (a Cambridge-trained astrophysicist) in discussing James Clerk Maxwell's complete theory of electromagnetism on pages 429-431 of "The Scientists" (Random House, NY, 2004):
Direct observation of a phenomenon, e.g. the measurable elliptical orbits of the planets in our solar system or the splitting of white light by a prism or diffraction grating into color components.
The available indirect observations and mathematical calculations of a phenomenon, e.g. electromagnetism or the "Big Bang" theory for the beginning of our universe.
The belief in religions which are based on faith rather than either direct or indirect evidence, e.g. gods or super beings responsible for all events including life and its direction.
The first two are evidence-based, testable and therefore "scientific truths" as stated by Maxwell in 1864, whereas the third is based on human-derived legend and myth bereft of evidence as stated by Gribbin.