Jesus is not alive in the TWD comics. The storyline and the challenges faced by the characters resulted in his fate. It's all part of the complex and evolving world of the comics.
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.