Belief Systems Overviews Here, you will find different Belief Systems that were practiced in the world in foundations period and are still practiced today. The summaries of different religions include how they were formed or founded and what their beliefs were mostly at their establishment. Some of the Belief Systems were created in the same region, like Hinduism and Buddhism, but still had not completely same beliefs. They greatly influenced each other over time and also accepted or refused some beliefs of each other.