Jesus is a real person documented not just by the authors of the Bible, but also by non-Christians from that time in hisotry. There is no real argument about the existence of Jesus or if he was crucified. Here are two non-Biblical sources of Jesus and His crucifixion.
Jewish historian Josephus in his book Antiquities of the Jews from around 95 AD writes about the execution of Jesus.
Roman historian and senator Tacitus in his book Annals from around 115 AD writes about the execution of Christ by Pilate.
The death of Jesus was a major event recorded by history not because a man was executed and died, but because of the reaction from His followers. Paul writes about the significance of this event to the followers of Christ in his letters.
For Jews demand signs and Greeks seek wisdom, but we preach Christ crucified, a stumbling block to Jews and folly to Gentiles, but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God. 1 Corinthians 1:22-24 ESV
But far be it from me to boast except in the cross of our Lord Jesus Christ, by which the world has been crucified to me, and I to the world. Galatians 6:14 ESV
The death of Christ should have been the end and it was, until Jesus changed history by appearing in bodily form alive to His followers.
Now Thomas, one of the Twelve, called the Twin, was not with them when Jesus came. So the other disciples told him, “We have seen the Lord.” But he said to them, “Unless I see in his hands the mark of the nails, and place my finger into the mark of the nails, and place my hand into his side, I will never believe.” Eight days later, his disciples were inside again, and Thomas was with them. Although the doors were locked, Jesus came and stood among them and said, “Peace be with you.” Then he said to Thomas, “Put your finger here, and see my hands; and put out your hand, and place it in my side. Do not disbelieve, but believe.” Thomas answered him, “My Lord and my God!” Jesus said to him, “Have you believed because you have seen me? Blessed are those who have not seen and yet have believed.” John 20:24-29 ESV
After that Christ returned to the Father and sent the Holy Spirit ushering in the Church Age that we currently live in. It is an age of grace and mercy. A time to repent of rebellion and a time to build a relationship with our Creator who is Jesus. That is why we like Peter and Paul preach “Christ crucified” who loved us so much that he willingly died on our behalf.
[King David] foresaw and spoke about the resurrection of the Christ, that he was not abandoned to Hades, nor did his flesh see corruption. This Jesus God raised up, and of that we all are witnesses… Let all the house of Israel therefore know for certain that God has made him both Lord and Christ, this Jesus whom you crucified.” Now when they heard this they were cut to the heart, and said to Peter and the rest of the apostles, “Brothers, what shall we do?” And Peter said to them, “Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.” Acts 2:31-32; 36-39 ESV