#3 is an interesting fact. I'll keep that in mind. Very interesting.

#2 sounds agreeable, so no duel to the death.

#1, however, is not entirely true.

"The Da Vinci Code" PLOT, as far as we know, is all Dan Brown's work.
"The Da Vinvi Code" IDEAS, ie Jesus being a father, were not his:

Many books, including "The Holy Blood, The Holy Grail", FACT books, have put forth the argument that Jesus fathered a child. Dan Brown was sued by the others of aforementioned book, but the courts ruled that ideas cannot be copyrighted (in this case, the idea of Jesus and Mary Magdelene), and so Brown did not 'steal' any content. Instead he used it as research for his book.

Other than that, I'll agree, "The Da Vinci Code" is fiction.