Just produce the body of Christ. Yet no such body has turned up. Now, I don't know anybody who has come back from the dead. Better than that, Jesus said he would come back from the dead, then he did . Harry Houdini said he'd come back, but he didn't .
Overcoming death is a big deal .
It can't be ignored. In Jesus' case, he claimed to be God in the flesh. He said that unless we accept him as our savior, we'll die in our sins and be condemned to eternal punishment. My conversion was not so much a result of a fear of hell, but rather respect for a person who overcame death. That gives him a lot of authority, in my opinion.