There are two main reasons why the separation of religion from the State is important:

(i) The first is to prevent the domination of one religion over another.

Example: Almost all countries of the world will have more than one religious group living in them.

Within these religious groups, there will most likely be one group that is in a majority. If this majority religious group has access to State power, then it could quite easily use this power and financial resources to discriminate against and persecute persons of other religions. This would violate Fundamental Rights.

(ii) The second is to protect the freedom of individuals to exit from their religion, embrace another religion or have the freedom to interpret religious teachings differently.

Example: We can give an example of untouchability in Hindu religious practice. If state power were in the hands of those Hindus who support untouchability, then it would be a difficult task for anyone to abolish this practice.