Luke Timothy Johnson on the “Historical Jesus” as Heresy

I’ve been reading through Luke Timothy Johnson’s The Creed and found this provocative statement:

[T]he most remarkable evidence for Christianity’s confusion – at both extremes [progressive and conservative] – is the fact that since the time of the Enlightenment, the longest-running of all Christologies heresies has deeply infiltrated the church with scarcely any protest or controversy, much less the calling of a council of bishops to clarify and defend the faith of the church. I mean the replacement of the Christ of faith with the so-called historical Jesus.

I wonder what the guys at The Jesus Blog would say to that?