Hmmm?! Christ was IMMEDIATELY relevant to the Roman Empire - He claimed to be a King. In fact, all religions were tolerated by the empire except Christianity because Christians would not ascribed deified status to the Emperor. Paul and Peter were both killed by Rome specifically because they were Christian - Nero liked to set Christians on fire and eat by the light of the flames. Christianity was always important to Rome, and it evetually even took over the empire.
His religious views were not important to Rome from the outset. He was encouraging sedition within the Empire, but that is relevant independent of his religious views.
Christianity was always important to Rome, and it evetually even took over the empire
In its early years, Christianity was nothing more than a minor sect of Judaism, which was a minor sect within the Empire. Mithraism, for example, was a much more important religion (Christianity got many of its ideas from Mithraism- a crucified and resurrected deity, borne of a virgin) during the time period.
No one can deny that Christianity became the dominant religion in the Empire and used that dominance to repress and snuff out all other religions. However, to say that Jesus was important to the Roman Empire at the time of his death is not true. To the Romans, he was nothing more than a provincial hick preacher who got mixed up in colonial politics and ended up paying the price.