I was told the other day that India has the only Baptist state in the world. Is that true?
No way! Maybe a state with a majority of its populace adhering to the Baptist faith, but not so in the official, political sense. India's constitution forbids religious demarcation, even if based on Hinduism. Note India has a terse relation with the world's only officially Hindu nation- Nepal, inspite of its "Hindu majority".
India has secular laws, and any attempt to associate into a religion-based separatist entity will be treated as treason/ rebellion to the Indian State, and will be put down. The Indian states of Goa and Nagaland have sizable Christian populations. Although Goa is peaceful, a change in religious composition of the tiny north-east state of Nagaland is linked to the allegation that the Church is funding an attempt at seccession from the Union. Please note, this is an allegation, so you do the research to understand better.
A "Baptist STATE" in India?! A "Baptist state" is an oxymoron (Did I spell this correctly?). Historical Baptist distinctives include strict non-entanglement between churches and civil government, at least in these regards. If this is confirmed to be the case, those "Baptists" have denied their distinctives. But then, many have, even here in the USA. I would say that any Baptists here who accept government money in so-called faith-based initiatives (e.g.) have denied their historical Baptist distinctives.