Are there countries where people of a particular religion are refused entry?

1. Which countries do not allow freedom of religion?
2. Can a country deny its citizens entry?
3. What is the least religious country in the world?
4. Which country has only one religion?

Which countries do not allow freedom of religion?

Tajikistan, and Turkmenistan have significant restrictions against the practice of religion in general, and other countries like China discourage it on a wide basis.

Can a country deny its citizens entry?

No one shall be arbitrarily deprived of the right to enter his own country. Fourth Geneva Convention, article 49: 49.

What is the least religious country in the world?

Countries

Which country has only one religion?

Governments where Buddhism, either a specific form of it, or Buddhism as a whole, has been established as an official religion: Bhutan: The Constitution defines Buddhism as the "spiritual heritage of Bhutan". The Constitution of Bhutan is based on Buddhist philosophy.