Where is Catholicism most popular?

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Tags

1. #united
2. #brazil
3. #states
4. #population
5. #italy
6. #taken
7. #decreasing
8. #according
9. #center
10. #largest
11. #countries
12. #figures
13. #mexico
14. #philippines
15. #order
16. #surveys
17. #research
18. #catholic
19. #catholics
20. #number
21. #factbook