@Phatkat - Both, if the soul is 'worthy' then it could become an angel. Others were created... like the Archangels.

@Shadolord - I'm going off the movie with Keanu Reeves as I haven't had the pleasure of reading the comics or seeing any other version aside from the first episode of the new show on BBCAmerica. :( I've been wanting to but... alas... no monies.