Mauritius is also a candidate as around half its population profess to be hindus. Not as high as India and Nepal, but still a potential answer to this question.
Nepal is obviously the answer though.
In August 2018, church president Russell M. Nelson asked members of the church and others to cease using the terms "LDS", "Mormon", and "Mormonism" to refer to the church, its membership, or its belief system, and instead to call the church by its full and official name.
I'm not really big on countries or organizations throwing their weight around in this way. It's a power move.
But if you insist, I have my own demand. You must hereby always refer to our site by its full and proper name: "The Glorious and Perfectly-Accurate Trivia Website JetPunk".