Maybe I should have posted this on the religion thread, but I didn't want to upset people there. Assuming the facts in the story are correct (OK, big assumption), there could be a prosaic explanation of what happened. Jesus was taken off the cross before he was dead, either because his mates bribed the guards, or because the authorities allowed it, due to political pressure or for some other reason. They patched him up and a few days later he was able to get around, but then he died of his wounds. Does that sound more likely than coming back from the dead?