Religion exists since people exist. People believe that religion gives them strength in life. Also, it plays a big role in various life situations like illness, war and hunger. Religion also had its downsides because it was the cause of many wars in history. The most famous religions are Judaism, Christianity, Islam, Hinduism and Buddhism. Religion is a very broad term and for this reason, there is no single definition of religion. It can be said that religion is a set of beliefs, symbols and rituals accepted by all believers. Many scholars have tried to define religion from their perspective, the most famous of which are: Emil Durkheim, Max Weber, and Karl Marx. With the advent of secularization, urbanization, bureaucracy and rationalization, great changes are taking place in society. From the Second World War until the 1960s, the Church in Croatia strongly opposed communism and its way of governing. From the 1960s until the 1990s, intolerance between religion and politics began to weaken. According to the research conducted, it can be concluded that religiosity in Croatia is gradually declining. According to research on moral issues, it can be concluded that Croats are gradually adopting a modern way of life. There are also people in Croatia who are not religious. Their view is that religious education classes should not be held in schools. Non-religious people are often discriminated against in society in various ways. Although this problem is gradually decreasing, it is still present among people.