I don't see anything wrong with that. As long as they don't put a gun on their head to convert them, it is a freedom of speech and freedom to practise what they believe. If you're not interested, simply say "No, thanks". You can do the same thing here in the USA to convert Americans into Hindu, you're protected by the law.Nobody is stopping you. Just because they have a different approach does not mean they are wrong. For those who believe Christain will ruin our nation, take a look at South Korea and Philippines. Early on, they thought the same and the Christains were prosecuted left and right. As of now, it has not stopped Korea from becoming a power house and their culture is still intact. Creating fear is also a part of religious propaganda, let us not forget that.
My 2 cents.