No they don't. It's fiction. There's many books of fiction taking place in/around historical events(such as the John Jakes novels "The Bastard" and the rest of the "Kent Family Chronicles") which are about lives interwoven with historic figures and times. Giving credence to someone's imaginative works only build it up in other's minds.
Can someone explain to me why charges should be answered when the Davinci Code is a work of fiction? I enjoyed the book and the settings -- in fact, found it fascinating but I also read it as a fiction book not history.