Kinda hard to prove the existence of Jesus without the Bible.
Not Really. Here’s what we have outside the Bible, on the existence of Jesus, and what was widely known about him in the pre-3rd century world.
1) Tacitus PAGAN 1st century Roman Historian
2) Suetonius PAGAN Chief Secretary to Roman Emperor Hadrian
3) Josephus JEWISH 1st century Pharisee, General, Roman Historian
4) Pliny the Younger PAGAN Roman Administrator, Author
5) Emperor Trajan PAGAN Roman Emperor
6) Talmud JEWISH Rabbis circa 70-200 A.D.
7) Lucian of Samosta PAGAN 2nd century Greek satirist:
8) Mara Bar-Serapion PAGAN between the 1st and 3rd centuries
9) Maimonides JEWISH 12th century sage
10) Philopon PAGAN 6th century
“...even if we did not have any Christian writings, “we would he able to conclude from such non-Christian writings as Josephus, the Talmud, Tacitus, and Pliny the Younger that: (1) Jesus was a Jewish teacher; (2) many people believed that he performed healings and exorcisms; (3) he was rejected by the Jewish leaders; (4) he was crucified under Pontius Pilate in the reign of Tiberius; (5) despite this shameful death, his followers, who believed that he was still alive, spread beyond Palestine so that there were multitudes of them in Rome by A.D. 64; (6) all kinds of people from the cities and countryside — men and women, slave and free — worshiped him as God by the beginning of the second century.” Wilkins, Michael and J. P. Moreland, eds. Jesus Under Fire: Modern Scholarship Reinvents the Historical Jesus. Grand Rapids: Zondervan, 1995.
Now THAT is nonsense. Prove that Alexander The Great lived. We actually have more and more recent witness testimony of Jesus than of Alexander The Great. If you slide scales to allow Alexander lived, how much more should one believe Jesus lived. And with the mountain of witness testimony to His resurrection, well, you have to change the scales in mid-comparison to reject the testimonies.