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India is a nation of multiple religions .The farmers of the constitution clearly felt that communalism may cause a major hindrance to the unity and integrity of the nation .Therefore,in the Forty second Amendment act 1976 the word secular was added.It means that the state cannot uphold any particular religion but protects all the religions equally .
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India is called a secular state because there is no discrimination of religions by the government or the Constitution. According to it, the government cannot give special rights to any religion. Also, any religion cannot be deprived of certain rights. The government also cannot interfere in religious matters except if these matters can be damage to public. 

These are some reasons why India is called a Secular State.