The significance of religious education in public school has been reconsidered by contemporary democratic states and major international organizations. An efficient religious education can reduce misunderstanding and conflict. It helps to enhance mutual understanding and mutual respect. It contributes to the realization of human rights and may develop ways of cooperation. However there are challenges of diversity, misunderstanding, and prejudices. In order to overcome these challenges and develop an efficient model of religious education in the public school of a plural democratic society the contextual characteristic of religious education should be recognized and a free, equal, and open public sphere for collective deliberation should be established.