@Nannyfannybanny, kudos to your DC!
Unlike DS, I don't think the Jesus of the bible existed - there would be archaeological evidence and Roman records (all that is claimed dates from after his time). The Jewish priests were working with the Roman oppressors, so there was a strong desire for revolutionaries with a kinder version of the religion and a hopeful message. As this took hold, it would make sense to roll these charismatic rebels into a single, symbolic character.
The great ones would definitely have been Derren Browns! Derren did a series on the 'miracles' performed by preachers all over Asia, Africa and America to this day.
People 'coming back to life' wasn't as rare then as it is today - though it still happens. As DD says, diagnostic instruments weren't very advanced. Several conditions can mimic death, which is why most cultures have a tradition of watching over the corpse for at least a few days.
I have my own ideas about what the mind's "God spot" represents in evolutionary terms - a remnant of the infant's perception of the parent, perhaps, and a sense of connection to all living things which seems to be default in most creatures. For me individually, the idea serves as a useful pivot for tried & tested psychological tools, I don't afford it any overwhelming importance.