You cant really have freedom of the religion in any meaningful sense if you dont allow prosletyzing. It is a central element in both Christianity and Islam that you should try to convert "heathens".
But it can be problematic in some contexts. Especially small tribes of nature people, whose entire culture is based around spiritual belief systems. Personally I would also be negative to missionary activities in places like Tibet, Bhutan etc.
I think other monotheists are "fair game" for Christian missionaries and Hindus as well. Given the extremely long histoy of Christianity in India you cant really call it a foreign religion.
Christian missionaries in India usually do target tribes who believe in animism and living with nature. At least their success rate is high there.
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