This is one country that has many people that follow the same religion

Afghanistan

Explanation:

99.97% of the country practice the Muslim religion adn only .03% follow Christianity.

Of the world's major religions, Christianity is the largest, with more than two billion followers. Christianity is based on the life and teachings of Jesus Christ and is approximately 2,000 years old.

Explanation:

i don't think it's c or d. i think it's either a or b.

hope this .