Hi, Kenn. There are other first-century sources that corroborate the life of Jesus, although not in any great detail. The Jewish historian Josephus, who was hostile to Christianity, writes of Jesus’ trial and crucifixion. The Roman historian Tacitus writes of him as well. The so-called “Gnostic” Gospels are second-century compositions. A prominent atheist whose name escapes me at the moment just published a book from a major press that is very hostile to Christianity but that also scolds his fellow atheists for playing the “Jesus didn’t really exist” card because there’s as much historical evidence for his life as for the life of almost anyone who lived in the ancient world.