Aaron Davidson in his on-line essay, Science as a Belief System says:
As humans we are born into this world without any preexisting knowledge about our universe. In order to cope and survive, we must make observations and draw conclusions from them. Without making observations and generalizations we cannot make sense of our surroundings. From birth, formulating a belief system is essential to our survival, and perhaps even to our consciousness.
Using the metaphor of science, a belief is like a hypotheses, and a theory, a set testable and sometimes tested hypotheses can be compared to a belief system. Just as science does, we make observations of the world. Just as science and the various scientific disciplines have their theories and sets of hypothesis, we have our belief systems and beliefs.
In our journey through life, we are constantly testing these beliefs and belief systems in real time through our actions and behaviors. Actions and behaviors result in feedback in the form of life experiences.