It's difficult to sway somebody to your side when religion has been used as a tool to control the masses out of fear or to rule over others since you "Speak to God." Furthermore, when there have been SO MANY religions in the history or mankind, and we have gone from Gods to God, its difficult to make someone believe you lol trust me, i've tried. To sway the really non believers, you'd need Jesus himself to come down here and show the world he is real.