Jesus and Satan. Great. Great!
Well, Jesus was fairly Satanic. At very least a cult of personality with the perfect story for people sick of Roman rule. Jesus was a Torah reclaimist. Judaisdm predated Roman paganism in the area by some 700 off and on years.
The belief in the the area had already transitioned to monotheism via *Ba'al (West) and Zoraster (East). It was effectively the western extant of a growing swath of the one true God.
* Ba'al was a transition god. During Canaan it was part of a pantheon. When reborn in Phoenicia it became the supreme god. Which was like training wheels for removing the pantheon. At the time of the old testament's writing the area was divided with Phoenicia to the North, and the "12 Tribes" to the South. Naturally the "Hebrews" (Which is what they decided to call themselves) made it so they were chosen instead rising from the ashes. Fighting over land and all. There was also no Exodus, Egypt just withdrew and the people left split in half.
So centuries later, when Rome invaded to control the entire Medditeranean coast it deposed The Herodian Kingdom of Judea. Told them you're going to adhere to paganism again.
It took less than a century for people of Jewish descent to rebel. And Jesus captured that angst like Trump in the 2016 election. Make Judea Great Again! He was born at the time of the Roman partition of conquered Judea in 6 CE.
If Roman paganism was the ruling master he was certainly the adversary. Enough to act like a present day muslim cleric warning those who will listen of the decadence of Rome (Western culture). His goal was sedition of the "new way" in any way you look at it.
And after several generations of telling his story it finally started getting codified. By 330 CE you had a cannon of tall-tale fan fiction as told through the telephone of successive generations.
In short: He was oppositional to the state of Rome and became a legend in the Roman province of "Syria Palestina" after he was executed for it. It spread from there.