Wishful thinking. Prophets who lied were to be killed in ancient Israel. A prophet had better be telling the truth.
That presumably accounts for how vague and ambiguous so many prophesies were; if you make them sufficiently long-term or omit the dates, you're unlikely to be around in any case. Of course, they too were prone to embellishment and modification.
Jesus had His life witnessed by multitudes. It is not a sound proposition to claim all were delusional and making it up.
That's not how it works. Even today, estimates of crowd size can vary by a factor of 10 depending on who does the estimating (e.g. police or protestors); even for crowds seen on TV by billions, as at Trump's inauguration. Another interesting human trait is that the number of people claiming to have been at some newsworthy event increases with time - for some events more people claim to have been there than the venue could contain.
You don't need 'multitudes' to have stories of multitudes, and you don't need to break the laws of physics to have stories of miracles - people are suckers for unlikely or magical stories, and happy to exaggerate them - that's why tabloid newspapers sell so well; why psychics can fleece willing crowds; why it's the basis of a significant proportion of TV entertainment...
All of your reasons omit God.
You noticed?
Today, most believe in spirits as well, if I recall a survey I saw. All cultures of all ages of history on the planet also believed in the spiritual. Rather than all of mankind being primed, I suggest you are primed for disbelief.
I'm certainly primed to be sceptical... and people have believed in spirits, ghosts, pixies, elves, demons, faeries, witches, magical and mythical beasts, all manner of gods, and a huge variety of superstitions, throughout recorded history - without a jot or tittle of substantive evidence that any of them ever existed or had any effect on the world except through man's belief in them and stories about them.
On the other hand, we have a raft of research that suggests that, from an early age, children are very suggestible and have a strong propensity to ascribe agency to even random or unexplained events, to believe in magic and superstition, and that these propensities often persist into adulthood (touches wood, throws salt over shoulder, crosses fingers, says a prayer).
The vast variety of myths, legends, and superstitions are just what would be expected from propensities to superstitious and supernatural beliefs in general, where all are explanatory fictions - and not at all what we'd expect in the absence of such propensities, and if one particular supernatural storyline was actually real.
“
Most people would rather die than think and many of them do!” - Bertrand Russell.
“
Yes, reason has been a part of organized religion, ever since two nudists took dietary advice from a talking snake.” - Jon Stewart