You could present them with a long list of references (all from their own publications during the past 120 years, and all of which they should look up themselves) to prove that the so called 'FDS' are among the most incompetent interpreters of scripure that this world has seen in two millennia.
Has any other religion been proved so wrong so many times about so many scriptures and doctrines? I challenge anyone to name another religion with a worse verifiable track record.