hope Leo doesn't mind me reposting a PM she sent me a while back:
I don't think I have posted any detailed threads for or against the existence of a historical Jesus; I am somewhat agnostic on the subject, although I lean towards Wells' assessment (against the mythicists) that while the gospels are literary compositions with the bulk of their narrative content being "fiction" (informed to some extent by mythic tropes and to a greater extent through haggadaic OT exegesis), there probably was a historical figure named Jesus who was crucified in Jerusalem at the time of Pontius Pilate's tenure. The synoptic sayings tradition in particular cannot be reduced to the mythicist schemes (what does the ethical/moral teaching have to do with the Hellenistic "savior god" mysteries?) and Paul shows some close familiarity with this sayings tradition. I think the best explanation for this is that the teaching has nothing to do with the "gospel of the cross", preceding it as a reflection of the teaching of a historical Jesus and with the kergyma of Jesus as "savior" arising after his death (in part through an exegesis of the Suffering Servant songs in Deutero-Isaiah) as a rationalization of the unexpected execution of the apostles' teacher. The gospels (aside from the Gospel of Thomas) represent a latter stage when the teaching (variously interpreted and modified by the different evangelists) has combined with the "gospel of the cross", especially prominent in the western Pauline branch of Christianity (where the ethical teaching has receded dramatically in the face of the personal role of Jesus as Lord and savior). The Jewish-Christian branch in the east, particularly represented by Peter and James (and reflected in such first-century writings as MATTHEW and the DIDACHE and such second-century writings as the ASCENTS OF JAMES and the KERGYMA PETROU), continued to stress the moral/ethical teaching and its halakhic value. The early gnostic branch of the south (particularly in Samaria and Egypt, but also in Syria), on the other hand, made Jesus a Savior by virtue of his teaching, i.e. esoteric gnosis.
I have some threads I have done in the past on the historicity of the gospel narratives (such as on the stories of Jesus' nativity, the 40-days temptation in the wilderness, the stories about Judas Iscariot, the trial scene with Pontius Pilate, etc.), but I'm not sure if that is what you meant. In short, the bulk of the stories are composed out of material from the OT, or turn parables (with their latent hyperbole) into miracle stories, or represent theological reworkings of possible historical stories. In general, the appearance seems to be that Jesus' later followers knew very little about Jesus' birth and childhood and very little about his trial and execution. This actually is to be expected since these followers were not around when Jesus was born and according to the gospels themselves, they all fled when Jesus was arrested. On the other hand, they seem to be very familiar with the teaching and that is what made the impression. What I should point out however is that I believe that many scholars' attempts to reconstruct who the historical Jesus "really was" and what he believed are illusory. Each scholar constructs a Jesus in his own image. I have my own thoughts on what might be more probable than other schemes (such as I favor a more apocalyptic Jesus than JD Crossan allows), but in the end it is all speculation.