The constitution can say whatever it wants. The only thing that matters is what actually happens on the ground. Successive governments have adopted Hinduphobic positions and laws while claiming to be secular. Why are only Hindu temples under the control of various state governments? Why don't governments take similar control of cathedrals, churches and mosques?
There is example after example proving my position. All you have is some words in a document that are belied by the actions of those meant to observe it.
> Right to Equality
Religious minorities can run their own schools where they can teach their children their way of life? Can Hindus do this qua Hindus? Again, words in a document that contradict other words in the same document.
> Hindu Marriage Act (a personal law) was amended to outlaw polygamy
Why were Muslims not given the same benefits or punished in the same manner (whichever way you want to look at it)? How can you be secular and equal if two men or two women are treated differently before the law for the exact same action? This is a joke masquerading as justice.
> Of course, the fascists will equate all proselytizing with forcible conversions.
You can believe that Christianity is so superior to local religious practices that an entire state almost completely adopted the religion voluntarily in 3-4 generations. Given the history of Christian missionaries in India, South America and other parts of the world and the tactics they adopted, this is a simplistic argument/position.
There is literature available from Missionaries, in their own words, as to their opinions about Indian religious traditions and the people practicing them. Arun Shourie has written a couple of books on the subject.[1][2]
An individual here or there converting to a different faith is one thing. When religions conversions are used to shift demography, this has national security implications. Separatist movements grew in Kashmir and Nagaland. The partition of India was done on Muslim vs. non-Muslim lines where Muslim-majority provinces became Pakistan. Onlygodists will always be in conflict with Manygodists because their worldviews are fundamentally different.
Organized conversions must be banned. If the constitution has to be amended to do it, so be it.
[1] Missionaries in India: Continuities, Changes, Dilemmas
[2] Harvesting Our Souls: Missionaries, Their Design, Their Claims