It's easy to say that you don't believe what you don't see, and then talk about ancient history like you know what happened. We CAN believe what other people have seen.
This includes Jesus raised from the dead. People who saw Him alive after His death were willing to die for their testimony that they knew He rose from the dead. A creed that historians trace to only a few years after His death says over 500 people saw Him. People die for lies, but lies they're told. The eyewitnesses who were killed for belief in Jesus in the first century knew whether He really rose or not; they had seen it! So they weren't deceived, nor were they lying-if they were, they would have renounced their faith to escape death.