Section Eight of Buddhism's Relation to Christianity (130ff) comprises a lengthy discussion of the "historicity" of Jesus Christ, reproducing at first the article from the internet site Wikipedia by the same name. The argument centers on whether or not, under the layers of mythical motifs that sober historians are not prepared to accept as "historical fact," there is a man named "Jesus," titled "the Christ," who had wandered about Judea and Galilee preaching a Hellenized and Romanized "Jewish" doctrine full of unique sayings attributable to a "historical" figure.
This "euhemerism" or "evemerism"—the theory named after the Greek philosopher Euhemeros or Evemeras (4th cent. BCE), who argued that the gods and goddesses were kings, queens and heroes of antiquity puffed up by supernatural biographical filler—may sound satisfying at first. However, as these mythological and other precedent layers are peeled, there remains no "historical" core to the onion, and a composite of 20 people, historical and mythical, is simply no one.
Source: Buddhism's Relation to Christianity