As the number of migrant populations increases, immigrants with foreign religions may personally or collectively engage in religious activities that conflict with the legal system of Aboriginal society. In this situation, to what extent can the state guarantee the freedom of religion of migrants? Does the guarantee of freedom of religious practice mean that freedom to refuse the legal obligations on the religious beliefs is guaranteed? Then, to what extent can the state guarantee freedom of religious practice without jeopardizing the generality of law? In the United States and Canada, which are multi-religious societies, social issues about minority religions have established themselves as an important national task early on. In particular, both countries have tried not to exclude religious minorities from both the public and private areas of Aboriginal society by recognizing religious exceptions to them through the legal action and judicial remedy. Not as much as the United States and Canada, but Korea has also entered a multicultural society, and the number of migrants in Korea has increased rapidly, and many of them have unfamiliar religious backgrounds. Although our constitution guarantees religious freedom, it is necessary to consider how much freedom of heterogeneous religious activities can be guaranteed by the state in the multicultural and multi-religious situation. Therefore, this paper presents implications for solving the problem of religious freedom in Korea through discussions between the United States and Canada, and sets the standard for solution based on them.