I don't know if this question fits here, but because I want an academic historical answr and I thought this would be the best place.

From my continuing study of Judaism, the idea of a dying and rising Messiah is almost unheard of, except maybe, just maybe, among a few here and there at the time. But the idea of a Messiah dying on a cross and rising from the dead on the third day as expressed in Christianity is a first among Jews. The vast majority of Jews never would have thought that the Messiah is supposed to die, let alone die at the hands of the Romans and then rise from the dead. That is used as an argument that whatever the disciples of Jesus experienced, must be earth-shattering because of how outrageous of a claim they made, and more so when the fact they were Jews, born and raised among Jews taken into account.

During the time of Jesus, late Second Temple period it is agreed that many claimed to be the "prophet" or the Messiah, and soon after, they were crushed by the Romans and their movement ended right then and there. But that is not what happened with the Jesus movement. On the contrary, by the mid-first century, they were visible enough for Nero to target them.

What is it that would explain such rise of a movement which should have been killed with the death of its founder like all the others? From an academic historical point of view, what are the possible explanations?