In certain regions, the profession of a creed other than the Catholic is seen as a threat to community unity. It is argued that the Catholic religion is part of the ethnic identity, and that the Protestants are not willing to participate in the traditional customs and practices (the tequio or community work, participation in the festivities and similar issues). The refusal of the Protestants is because their religious beliefs do not allow them to participate in the cult of images. In extreme cases, tension between Catholics and Protestants has led to the expulsion or even murder of Protestants in several villages. The best known cases are those of San Juan Chamula, in Chiapas, and San Nicolás, in Ixmiquilpan, Hidalgo.