Some of the higher academic theological stuff simply does my head in - niether 'theo' nor 'logical'. Trying to fit the concepts and actions of Christ into a post modern mindset is like trying to herd cats. I've read a few 'strands' of what passes foor thought in various camps, and quite honestly, I think half the time they only write to justify their pay cheque.
Anchorman
Just a note of clarification here (for those who can manage to read this kind of thing without nodding off). We both used the word 'higher'. I think you meant it in a general sense, whereas in the critical studies of the last 200 years or so, the words "Higher Criticism" (and also "Lower Criticism") have a specific meaning, nothing to do with superiority or inferiority. The analogy is that of a river. The 'Lower Criticism' is concerned more with the translation and interpretation of the scriptures. Though there are areas of overlap, the 'Higher Criticism' attempts to 'get closer to the source', and attempts to unravel what Jesus may have actually said and believed, what the early Christian groups believed, indeed to determine whether anything authoritative can be said on these things, or whether there was even an historical Jesus at all. As alluded to in bluehillside's quote above, the guiding principle is reason, but the early protagonists of these critical methods never set out to destroy faith.
As well as the big-shots of Protestant Liberalism that blue quoted, notable names in this area of study are D.F. Strauss (who was the first to really stick his neck out), Bultmann, Schweitzer (of course), right down to more modern thinkers such as Geza Vermes, E.P. Sanders, Bart Ehrmann and Barrie Wilson*.
It is such thinkers (along with the fundamentalists and the Protestant Liberals) that
'Post-liberal theologians' think they have completely superseded.
*A writer I only came across recently. He certainly helped clear up a few puzzles I'd had regarding Paul's input into Christianity.