Belief that costs nothing to hold will always lose to a fear that costs something to face.
Conviction by itself moves nothing. What moves a person is whichever association weighs more at the instant of choosing, and standing inside that synagogue carried these men's whole identity, so saying the name of Jesus out loud registered as losing themselves rather than finding anything. Real belief, outvoted, because the levers were weighted long before the question arrived.
Every choice handed to the crowd thickens the link between approval and survival, which makes the next crossing harder rather than easier. That is how faith becomes an opinion a man can hold his entire life without it costing him a friendship or changing a single hour of his week.