Religion is a collection of beliefs and practices that relate humanity to spiritual matters. There are approximately 4,200 religions worldwide. Sociological theories provide perspectives on religion's role in society from symbolic interactionism to functionalism and conflict theory. Religion and magic were once intertwined but western monotheism separated them. Faith dispels doubt while religion risks losing touch. Religions fulfill functions like facilitating morality and social cohesion. Religious organizations include movements, denominations, sects and cults. Major world religions and their future decline are also discussed.