The Universal Declaration of Human Rights.

Article 18:

Everyone has the right to freedom of thought, conscience and religion; this right includes freedom to change his religion or belief, and freedom, either alone or in company with others and in public or private, to manifest his religion or belief in teaching, practice, worship and observance.

Article 19:

Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless any frontier.

P/S: In Malaysia, however unfortunate, we are severely lacking of the latter.