Religious beliefs are found in virtually every society throughout human history.[citation needed] Many native traditions held clowns and tricksters as essential to any contact with the sacred. People could not pray until they had laughed, because laughter opens and frees from rigid preconception. Humans had to have tricksters within the most sacred ceremonies for fear that they forget the sacred comes through upset, reversal, surprise. The trickster in most native traditions is essential to creation, to birth".

Religious knowledge, according to religious practitioners, may be gained from religious leaders, sacred texts (scriptures), and/or personal revelation. Some religions view such knowledge as unlimited in scope and suitable to answer any question; others see religious knowledge as playing a more restricted role, often as a complement to knowledge gained through physical observation. Some religious people maintain that religious knowledge obtained in this way is absolute and infallible (religious cosmology). While almost unlimited, this knowledge can be unreliable, since the particulars of religious knowledge vary from religion to religion, from sect to sect, and often from individual to individual.

Early science such as geometry and astronomy was connected to the divine for most medieval scholars. The compass in this 13th Century manuscript is a symbol of God's act of creation.The scientific method gains knowledge by testing hypotheses to develop theories through elucidation of facts or evalution by experiments and thus only answers cosmological questions about the physical universe. It develops theories of the world which best fit physically observed evidence. All scientific knowledge is probabilistic and subject to later improvement or revision in the face of better evidence. Scientific theories that have an overwhelming preponderance of favorable evidence are often treated as facts (such as the theories of gravity or evolution).

Many early scientists held strong religious beliefs (see Scientists of Faith and List of Christian thinkers in science) and strove to reconcile science and religion. Isaac Newton, for example, believed that gravity caused the planets to revolve about the Sun, and credited God with the design. In the concluding General Scholium to the Philosophiae Naturalis Principia Mathematica, he wrote: "This most beautiful System of the Sun, Planets and Comets, could only proceed from the counsel and dominion of an intelligent and powerful being." Nevertheless, conflict arose between religious organizations and individuals who propagated scientific theories which were deemed unacceptable by the organizations. The Roman Catholic Church, for example, has historically reserved to itself the right to decide which scientific theories are acceptable and which are unacceptable. In the 17th century, Galileo was tried and forced to recant the heliocentric theory.