In communalism the problem begins when religion is seen as the basis of the nation.
Communal politics is based on the idea that religion is the principal basis of social community. Communalism involves thinking along the following lines. The followers of a particular religion must belong to one community. Their fundamental interests are the same. Any difference that they may have is irrelevant or trivial for community life. It also follows that people who follow different religions cannot belong to the same social community. In its extreme form communalism leads to the belief that people belonging to different religions cannot live as equal citizens within one nation. Either, one of them has to dominate the rest or they have to form different nations.