So long as the conversion is requested by a person of his own will, you really cant blame the missionaries or any other organisations. This form of religious freedom cannot be curtailed.
If he/she chooses to forgoe his original religion in favour of another, why do we care? His life, his choice, his decision.
We care when someone is forced to convert to another faith, either by coercion or through monetory or other unscrupulous means. That Sir, will be utterly unacceptable. And dont expect to carry out such a plan and not get the locals riled up.