Country 8: Winner:
Clue #1: I am one of the largest countries in the world.
Clue #2: While I have no official religion, more than 80% of my population follow 1 religion making me the country with the second-most followers of that religion in the world. (lol, hope that didn't come out as chinese )
Roman Catholics are 89% of the total population, 47% percent of whom attend church services weekly, one of the highest in the world. In absolute terms, Mexico has the world's second largest number of Catholics after Brazil.