Freedom of religion

Freedom of religion is widely considered a fundamental human right. For example, one of President Franklin D. Roosevelt's "four freedoms" is "freedom of worship". It also appears in the United Nations General Assembly's 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 community with others and in public or private, to manifest his religion or belief in teaching, practice, worship and observance.

However, some countries do not even pretend to observe this. In Saudi Arabia (which abstained on the Declaration), the practice of religions other than Islam is banned, and some other Muslim countries forbid Muslims to leave their religion.