Short answers, pulled from the story.
Virtually all modern scholars of antiquity agree that Jesus existed historically. This consensus stands firm despite the challenge posed by the Gospels, which are not biographies in the modern sense.
Early non-Christian sources that attest to the historical existence of Jesus include the works of the historians Josephus and Tacitus. Josephus scholar Louis Feldman has stated that few have doubted the genuineness of Josephus's reference to Jesus in book 20 of the Antiquities of the Jews.
In Galilee, north of Judea, Jesus conducts a largely successful ministry where he preaches throughout the region. The Kingdom is portrayed as both imminent and already present in Jesus's ministry.
Matthew has 27 generations from David to Joseph, whereas Luke has 42, with almost no overlap between the names on the two lists. The lists are identical between Abraham and David but differ markedly from that point onward.
By the end of the 1st century, Christianity began to be recognized internally and externally as a separate religion from Judaism. The early Gospel message was spread orally, probably in Aramaic, but almost immediately also in Greek.