Few scholarly developments have been an interesting as the modernistic dehistoricization of John and the de-Johannification of Jesus. To a certain degree, each of these trends has bolstered the other, and the assertion of many a scholar claiming the authoritative weight of critical and scientific study is that the one thing we know for sure is actually two: the Fourth Gospel is of no historical value, and historical Jesus research must be performed untainted by any Johannine influence. The question is the degree to which either of these assertions is true, a solid platform upon which to base the frameworks of further studies.
Anderson, Paul N., "Why this Study is Needed, and Why it is Needed Now (from John, Jesus, and History, vol. 1)" (2007). Faculty Publications - College of Christian Studies. 111.