Yes, every religion has groups but there is no country where a small minority group is ruling over the majority group. Have you seen any country where 15 % Shias ruling over 85 % Sunnis or vise versa. But India is the only country where 15 % upper castes are ruling ruthlessly over 85 % of population, mainly OBC/SC/ST. That is the problem, different groups or sects or not problem.
