YOU might want to do YOUR homework before jumping in the deep end of the pool.
Pope Innocent III (A.D. 1198 - 1216): "With our hearts we believe and with our lips we confess but one Church, not that of the heretics, but the Holy Roman Catholic and Apostolic Church, outside which we believe that no one is saved." (Denzinger 423)
http://traditionalcatholic.net/Tradition/Information/Salvation_Outside.html
Not to mention the Council of Trent around 1525 pronouncing over a hundred curses, anathemas, death warrants, etc. against heretics(non-Catholic Christians)...