Religion relates humanity to spirituality and morality through systems of belief, culture, and worldviews. Religions provide explanations for life and the universe through narratives, symbols, and sacred histories intended to give meaning to existence. They also influence ethics, laws, and lifestyle through perspectives on reality and human nature. The top five largest religions in the world by population in 2000 were Christianity at 33% of the world population, Islam at 19.6%, Hinduism at 13.4%, Chinese folk religion at 6.4%, and Buddhism at 5.9%.