Why shouldn't religion and politics mix?

Religion should not be mixed with politics. Because in a country like India there are numerous religions. What is happening today is the politicians are using these different religions for their vote bank. Sometimes they also provocate the people by their speeches which results then in communal disharmony which is simply dangerous for the unity of our country. Besides, the people must understand that they do not elect such people who try to divide them in the name of religion. Instead we must elect such candidates who vow to work for the peace and the development of the nation.