[Cronos]

on the site of the Golden Temple.

Exactly -- the Vatican is smaller than the size of the great Hindu temple complexes like in Southern India. NO other religious monument shoudl be built INSIDE those complexes (though they can be build outside the complex in the city). Similarly, no temple should be built inside the Vatican but Hindus are free to do so in the larger city of Rome.

[Unam Sanctam]

The Vatican City is a few square acres and a few hundred residents. As far as I know, if one were to convert to Hinduism, I doubt it would be illegal, although if they work in a Church position, they would probably lose their job. Moreover, I imagine they could easily exit to Italian soil and find a Hindu temple in Rome. Contrast that with the huge nation that is India, where there are laws preventing the fundamental human right of freedom of religion. Don't talk to me about coerced conversion, which of course the Church does conduct, since the Hindu extremists interpret the mere provision of charitable social services as "coercion".