A myth can’t survive 2,000 years. No one has been able to disprove that Jesus walked this earth. No one has been able to disprove that He didn’t rise from the dead. And you are right, would men willingly die for a man if they did not know for a fact that he had conquered death with his resurrection? He told them if they believed in Him they would never die. They believed.
“A myth can’t survive 2,000 years.”
Have you maybe heard of Buddhism?