What are the other historical evidences that can be shown as a proof of Jesus crucification when an unbeliever don’t believe in bible ?
The most famous Jewish historian Flavius Josephus refers to James, “the brother of Jesus, who was called Christ.” There is a controversial verse (18:3) that says, “Now there was about this time Jesus, a wise man, if it be lawful to call him a man. For he was one who wrought surprising feats…He was [the] Christ…he appeared to them alive again the third day, as the divine prophets had foretold these and ten thousand other wonderful things concerning him.”
One version reads, “At this time there was a wise man named Jesus. His conduct was good and [he] was known to be virtuous. And many people from among the Jews and the other nations became his disciples. Pilate condemned him to be crucified and to die. But those who became his disciples did not abandon his discipleship. They reported that he had appeared to them three days after his crucifixion, and that he was alive; accordingly he was perhaps the Messiah, concerning whom the prophets have recounted wonders.”
I want to say, the Bible is the most important source of evidence for the crucification of Jesus, that less than 200 years after events took place are considered very reliable evidences. And the vast majority of scholars (Christian and non-Christian) admit the New Testament.
The essence of the people asking for the proof outside the Bible is that he/she doesn’t want to believe. If he/she doesn’t believe the believable Bible, it will not be much helpful to show other proof.
The Babylonian Talmud (Sanhedrin 43a) confirms Jesus’ crucifixion on the eve of Passover and the accusations against Christ of practicing sorcery and encouraging Jewish apostasy.
Stoic philosopher from the Roman province of Syria, Mara Bar-Serapion confirms that Jesus was thought to be a wise and virtuous man, was considered by many to be the king of Israel, was put to death by the Jews, and lived on in the teachings of His followers.