@Fernando
Your approach will never work. As soon as a JW hears someone wants to discuss 'good news' and 'kingdom', they'll immediately go to the WTBS-CDROM and print out every article on 'good news of the kingdom'. Then they'll focus on those articles as if they were inspired. Their brain is hard wired to support WT doctrine.
Even if you point-blank point out what you're trying to say, from the bible, they'll deny it in favor of some Watchtower understanding from two decades ago.