Really. You're basing everything you know about Jesus from two sources. The first of which is the New Testament of the Bible, which is not at all historically reliable. The second is the writings of first century Christian writers. How about first century non-Christian writers? Zero mention of Jesus. This is probably because early Christianity was even more of a pagan, myth-centered cult than it is today.
Actually the earliest copies of the gospels and letters of the NT have been found to be within 2 generations of the apostles.
IIRC some of Paul's earlier letters were written only one generation after Jesus's death. And Tacitus also mentions Jesus, though I'm not sure how first-century he is off the top of my head.
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