Well if you have confidence in your religion you would not care. If you do not, then I see how it could be a big concern. Same as Islam they fear any competition.
You are grossly mis-informed. Hindu religion is the most peaceful in the world. Hindu warriors never invaded any foreign country. Not only that unlike Christians who believe only way to heaven is through Christianity, Hindu’s are much more tolerant of other religions. Buddha was born in India. There are more Muslims in India than most other countries. Other religions such as Jains, Sikhs, Zoroastrians, Bahai’s, Christians, Buddhists, and a few more live in India in very large numbers.