The history of the Catholic Church is littered with heresies, and this is not even a new one, it's just a rehash of Gnosticism.
In the long run this will probably pique the interest of a lot of materialistic pagans in the truth about Christianity and Catholicism who never would have cared otherwise.
And silence didn't deliver the Church from them.
Brown is promoting heretical and blasphemous beliefs which must be refuted and repudiated.