how many religions are followed amongst the people who've worked in the ground forces of the army of the guardians of the islamic revolution ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_militaryBranch dbr_Ground_Forces_of_the_Army_of_the_Guardians_of_the_Islamic_Revolution sep_dot var_x dbo_religion var_uri brack_close