Hey can we be practical here. 
If India is a religious state do you think Christians and Muslims would be able to practise their faith in peace. Some pundit would have a bad dream and then blame the minorities for the same.
In a sense I agree with you.There is some preferential treatment to some religions. Inspite of it growth has been very dismal. There are different reasons for the same, but we would have to agree that without secularism and preferetial treatement, growth(however negligible) would have been very difficult. It is not just the minorities who get preferential treatment. Reservation based on castes also exist. It is very easy to get carried away and say that reservation should be rooted out and all people be treated equal.
Do you think “secularism” is the only reason political parties play vote bank politics. Please, I expected better from you. :o
If India was a religious state, vote bank politics would have been based on castes.