NEW : Speaker calls U.S. `` one of the best places in the world to live '' and work. Event drew protesters , criticism from Christian leader , `` very nasty e-mails ''
NEW : Speaker calls U.S. `` one of the best places in the world to live '' Prayer event sought to inspire Muslims and all Americans , one organizer says . Event drew protesters , criticism from Christian leader , `` very nasty e-mails ''