Right now, India has the second LARGEST population of Muslims in the world; over 175 million of them; 11 percent of the world’s Muslims!
That’s NOT counting Pakistan or Bangladesh.
Only Indonesia has more Muslims, with 210 Million.
If India had included all of British India it would be more than a third Mohammedan. And all the more likely that such a large minority would distort India's politics.
Again: No thanks.