We can read the Bible and perhaps even worship God from a natural standpoint and we will find ourselves lacking personal fulfillment. It is much like trying to understand and appreciate priceless works of art with our eyes shut. Consider the passage of study. The people of the day had witnessed tremendous and spectacular happenings. The veil of the temple ripped into two parts.
Graves burst open and dead people walked around.
The times were both exciting and awesome. These things simply had never happened before and hundreds of people witnessed the miracles and therefore they could not be denied by any reasonable person. However, the idea of understanding must come from a faith deep within our soul and that is supernatural not natural. The risen Christ empowered and commissioned the disciples to become apostles and sent them out to a lost world. This included facing the civil authorities and standing up for Christ regardless of the danger or outcome.