I respectfully disagree. The devil's greatest shot was that he managed to convince half the world he does not exist.

When we recognize there is an enemy and publicly expose him, he is weak and vulnerable, because the evil spirit becomes a sitting target front of well armed christian men and women of God, who take him down with the power of God.

I dont see any harm in discussing the Da vinci code, in fact it has shown and convinced many christians what to answer to non believers, and shook many sleepy people up.

now that we know who and what this demon is,  God empowers His children to take this filthy demon down and destroy his stronghold with the Word and Spirit of God in Jesus Christ, ever living and ever lasting and risen forever.