Modern trends that affect religious life, including the development of various forms of secularism and fundamentalism, cause lawmakers to define limits of religious liberty anew. In the context of globalization crucial are the norms and activities that quarantee freedom of religion and conscience in the international scope. Here of special importance are three systems of protection of religious and worldview liberty: 1) system which is based on the European Convention of Human Rights, 2) system which was introduced unilaterally by the United States of America, and 3) system that is a part of international policy of the Holy See/the Vatican. Study of principles and achievements of those three basically diverse models may prove useful for understanding inter alia the nature of today’s controversies regarding the scope of legitimate presence of religion in the public life of various countries.