There aren't any!
Romans 10:12-18 (NIV) For there is no difference between Jew and Gentile--the same Lord is Lord of all and richly blesses all who call on him, 13 for, "Everyone who calls on the name of the Lord will be saved." {Joel 2:32} 14 How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? 15 And how can they preach unless they are sent? As it is written, "How beautiful are the feet of those who bring good news!" {Isaiah 52:7} É18 But I ask: Did they not hear? Of course they did: "Their voice has gone out into all the earth, their words to the ends of the world." {Psalm 19:4}