To distinguish fact from fiction in the Jesus Revolution, look at historical records. For instance, records of church growth during that period are facts. Fiction might be unsubstantiated stories of miracles that have no reliable witnesses. Also, if a story seems too good to be true, like everyone having the same experience, it might be fictional. In contrast, real accounts would show the diversity of experiences within the movement.
The Jesus Revolution had real elements. Factually, there was a significant spiritual awakening among the youth in the 1960s - 1970s. Many young people turned to Christianity. It was a movement that brought new life to churches. Fiction might be some exaggerated claims about instant conversions being permanent for everyone. In reality, like any spiritual journey, it had its ebbs and flows.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.