The paper analyses the research data on religiousness collected at different periods in Serbia and former Yugoslavia. The aim of the paper is to point to the tendencies in religious practice and the expansion of religiousness among young people in different periods, as well as individual psychological factors of religiousness. The data shows that the number of young people who declare themselves religious has increased significantly in the last 15 years, compared to the period of a quarter of century ago. In addition to the revival of tradition as an answer to social crisis and uncertainty which affects young people most, the increase in religiousness is connected to certain forms of social democratization as well as it being socially desirable. The data on social-demographic correlates of religiousness shows that the degree of religiousness varies depending on the age, gender, social background and education level. However, the more recent research data shows that these differences have become smaller which indicates a certain homogenization among young people. Religiousness is consistently and positively connected to authoritarianism, conformism and intolerance, while certain changes have occurred in regard to its connection with desirable social values. Similar to the tendency observed in other research on values the data on factors and correlates of religiousness, especially among young people, point to a specific value relativism and confused values.