There is usually an implication that part of the conscience of every human being is eternal. This manifests itself in beliefs of reincarnations and eternal life at the end of the world . There are many ways of classifying the religions of the world. One classification is to describe a religion as being either linear or cyclic . Christianity, Islam, Judaism, and Parsees are linear.
Cyclic religions have the idea of birth, death and rebirth, with reincarnation a major theme.
Hinduism, Buddhism, Jainism are cyclic. Another classification is by deity numbers. The monotheistic religions are Judaism , Christianity , Islam , Parsees , Sikhism and the Bahai . Polytheistic religions have many gods. Most primitive or animistic religions are essentially polytheistic.