The article analyses how religious education might contribute to citizenship education, to reduction of undemocratic citizenship and to the objective to educate an active, tolerant citizen who is able to develop an intercultural dialogue. Analysing the possibilities and methods of contribution of religious education to citizenship education, the relationship between religiosity and citizenship, between religious and citizenship education are discussed. Service learning is presented as a method serving the development of the preferable multicultural and socially active citizenship, strengthening interreligious understanding and solving interreligious conflicts. The article presents action research applying the service-learning method which was applied in one Lithuanian university in 2006. The results of the research are discussed as well.