They're Just Upset that Jesus' Descendants Would be French

Defenders of Christianity Rebut 'The Da Vinci Code' (New York Times article by Laurie Goodstein, April 28, 2004)

Fearing that the best-selling novel "The Da Vinci Code" may be sowing doubt about basic Christian beliefs, a host of Christian churches, clergy members and Bible scholars are rushing to rebut it. 

Readers have bought more than six million copies of the book, a historical thriller that claims Christianity was founded on a cover-up — that the church has conspired for centuries to hide evidence that Jesus was a mere mortal, married Mary Magdalene and had children whose descendants live in France.