How is that even possible? There’s no way of making a border that has all Hindus on one side and all the Muslims on the other. Why would any indian Muslim choose to be part of a country that doesn’t include the greatest parts of Islamic civilisation in India, the Taj Mahal, the Gol Gumbaz, the tomb of itimad ud daulah? And how would either state treat all the non Hindu or Muslim inhabitants such as Buddhists and Christians? Even the two categories of Hindu and Muslim have so many subcategories with almost nothing in common even in matters of religion and communities that straddle the two- the whole idea is so chimerical and impractical as to be entirely unworkable.
OOC: I was reading a book the other day called the Argumentative Indian which featured a defence of Indian secularism and the first thing it refutes is the non existence critique- it tends to be western observers, who refer to Pakistan as a Muslim state and India as a Hindu state, when India has secularism enshrined in its constitution and ideals of the state, and apart from the Hindutva types in power now, has tended towards treating all religions equally. Now I know the op doesn’t explicitly say that otl India is a Hindu state, but it implies it, which I think betrays the inclusive ideals that allow for a full appreciation of India.