@JPB,
If one believes the bible and all the miracles that were performed during that period, then any notion of questioning the bible is moot. However, if we understand mythology, history, anthropology, geology, and the cessation of miracles after the bible was written, we can assume "logically" that the entire bible is a fiction.
Just because the concept of healer/miracle worker was not unusual 2,000 years ago, that doesn't tell us they were rational in terms of contemporary understanding of religions and science.
There are still some cultures of this world that practices some forms of religious rituals that are based on healer/miracle workers. Do you still believe them?