τίς ἐστιν ὁ νικῶν τὸν κόσμον εἰ μὴ ὁ πιστεύων ὅτι Ἰησοῦς ἐστιν ὁ υἱὸς τοῦ Θεοῦ;

1. τίς
   someone
   who
2. ἐστιν
   is
3. ὁ
   the
4. νικῶν
   conquering
5. τὸν
   the
6. κόσμον
   world
7. εἰ
   if
8. μὴ
   not
9. ὁ
   the
10. πιστεύων
    believing
    trusting
11. ὅτι
    that
    because
12. Ἰησοῦς
    Jesus
13. ἐστιν
    is
14. ὁ
    the
15. υἱὸς
    son
16. τοῦ
    of the
    the
17. Θεοῦ
    God
18.  
    ;
     

Who is conquering the world if not the one who believes that Jesus is the Son of God?