Jesus wasn’t the first person to be heard from after he’d died; there is the story of Saul, Samuel, and the “Witch of Endor” in 1 Samuel and a couple of other bible references and apparently in old-kingdom Egyptian times it was not uncommon. Nonetheless by Jesus’ time it hadn’t been seen in several centuries and people were starting to turn into atheists, without having Chuck Darwin as an excuse.
Ah, Jesus was more than “heard from” after He died. He physically rose again.