I don't think that's true. Many people saw the resurrected Jesus, including many of his enemies. Not only that, archaeological discoveries continue to support the Bible's historical accuracy.
So, lets look at the evidence:
1. Jesus' tomb found empty
Now many stories have been spread such as "his disciples stole the body". But such stories have been universally discredited by virtually all new testament scholars. For his apostles to steal the body they would have had to overcome the Roman Guards, a feat I would think would be far too great for them to accomplish considering how strong the Roman empire was at the time.
Apostolic tradition based on the Gospel accounts, not archaeological evidence as the site of Jesus' tomb has yet to be determined, there are several sites that are suggested bit not a single one that has been proven to be the supposed tomb of Jesus.
2. Women Eyewitnesses
This one I find particularly fascinating. Women in biblical times were treated as second class citizens, yet Jesus Christ chose to reveal himself first to a woman in order to show that God does not show favourtism. That woman was Mary Magdalene. Women would not have been used if this was some made up fairytale.
Well, in Matthew and John, Mary Magdalene (and the other women) did not enter the tomb but went to tell the disciples, in Matthew they were told by an Angel that Christ has risen prior to getting the Disciples, in John, it was the Beloved Disciple and Peter that they fetched and they both entered the tomb to witness the Angels who said that Christ had risen.
In Mark and Luke, the women found the tomb empty and witness the Angels (although Mark says it is a young man and Luke, two men in shining robes rather than Angels). Then they went to tell the disciples (who in Luke didn't believe them).
The disciples return back to there homes (John) while Mary remained, When Jesus revealed himself the simple answer is that Mary was simply the one that was there when he did, she was the only one waiting on him. She was the only one to show no fear or pride in her belief, Jesus revealed himself to Mary because she stayed when all the others had left. It is as simple as that.
3. The rise of Christianity
The actual explosion of growth of Christianity is staggering. Simply put, the Jews had no reason to believe in a dying saviour let alone a rising one. What is it that made the apostles to come to believe so strongly that God had raised Jesus from the dead? The only explanation is that he did indeed rise from the grave.
The better explanation is that there were many messianic sects and holy men in and around Israel at the time (John the Baptist?), this did not change after the crucifixion, Rabbinic Judaism was in its infancy, Second Temple Judaism was being increasingly associated with the Occupation and tyranny of the people, Like many examples of a radical and opposing ideology Messianic Judaism and then Christianity offered something to the people that the existing religious authority had forgotten, they offered escape from the suppression of occupation and hope to those people most affected by it, across the near east it spread by word of mouth and through persecution and eventually through Roman political expediency, Christianity gained traction with the power brokers of Rome and then obviously the Emperor himself. Christ rising from the Grave or not had little to do with it, and it certainly doesn't prove one from the other.
4. Over 500 people saw the risen Christ
More than 500 eyewitnesses saw the risen Jesus Christ at the same time (1 Corinthians 15:6). He states that many were still alive when he wrote the gospel (around 55 A.D). There were no objections when he wrote the gospel. And to discredit this story atheists say 'well they must have been hallucinating'. But again, such nonsense has been discredited. If it was or two people, maybe, but over 500 people? I think not.
We do not have 500 different eyewitness testimonies, in fact we do not have any testimonies as to the veracity of the accounts, only the words of the Gospel. Again this is not independent evidence.
5. Conversion of Paul
Before converting to Christianity, Paul was an aggressive persecutor of the early church. When Christ revealed himself on the Damascus Road, Paul became one of Christ's influential followers. He suffered greatly, enduring years of persecution and ridicule. Finally the Roman emperor Nero had Paul beheaded because the apostle refused to deny his faith in Jesus. Tell me, what kind of man would give up a life of ease to suffer such hardships? Man may be foolish, but none as foolish as that. Many more people also gave up their lives for Christ. No delusion is that strong. The fact is Paul encountered the risen Christ and helped the message of God to go out to all the world.
We do not actually know how Paul died, it is tradition that he was martyred, but we have no accounts as to this. There is also not unsubstantial opinion that the Pauline Epistles were a corruption of what Christ expressed and in many ways are counter to what the Ministry of Jesus was actually about. Again, none of what you say is independent evidence, it is evidence that informs your beliefs, but it has little expectation other than that.
I'm sure you'll find a suprise