The answer is that we know very little about the history of Jesus. Aside from the Synoptic Gospel writings-(Saints Mark, Matthew, Luke & John), as well as the brief writings of the Jewish Historian Flavius Josephus, there is very little actual written historical evidence that Jesus existed. The Acts and Epistles of Saint Paul, like the Gospels, were written AFTER Jesus' death. If you remember The New Testament, much of Jesus' biographical life-(that is to say his elementary years, his adolescence and his early adulthood are barely discussed. There appears to be a chronological jump in time from Jesus' infancy and babyhood, to his early 30's).
There are the "Apocryphal" stories which talk about Jesus' life from a seemingly unconventional and non-traditional perspective; these are stories that shed some light into Jesus' earlier and developing years.
There are many Churches in Israel-(besides the famed Via Dolorosa), that date to the time of Jesus, his parents, Joseph and Mary, as well as to Mary's parents. There is also the Crypt that Jesus and his family stayed in when they fled to Egypt; the (alleged) Crypt is a Shrine Museum in Downtown Cairo. The presence of various Jesus and Apostle based Churches-(that is to say, Churches built on the historical centers which chronicle the Jesus story), are widely believed by most Christians to be historically and archaeologically accurate centers chronicling Jesus' life and times. Of course, such claims can be disputed and the nature of these claims are not necessarily rooted in historical fact, but instead, are more deeply rooted in the wider lore and mythology surrounding the life, ministry (and alleged miracles) of Jesus.
Ultimately, the Jesus story has been and is still very much, a story based on personal, as well as collective faith for the 2 billion persons around the world who identify themselves as, "Christians". The combined historical and miraculous nature of Jesus, has been comfortably and faithfully reconciled by many of the followers of Christianity over the centuries.
However, for the 5 billion persons around the world who are not self-identified Christians, there is the historical Jesus, as well as the mythologized Jesus, but not the miraculous or deified Jesus. For 70% of the world's current religious population, the ability to reconcile the historical and miraculous nature of Jesus with relative ease and comfort, is incomprehensible and ultimately, does not exist in their religious and theological worldview.
I suspect that much more will be learned regarding the historical biography of Jesus. With the fantastic developments in archaeological technology, combined with increasing curiosity and awareness of the distant past, the Chapter on Jesus' full historical biography has not been closed, but is opening up with great eagerness and interest.