It Is Always the Resurrection that Makes People Upset
Note that it is only when Paul mentions the Resurrection that Festus interrupts:
24 At this point Festus interrupted Paul’s defense. “You are out of your mind, Paul!” he shouted. “Your great learning is driving you insane.” [Acts 26:24]
Folks are okay with Jesus as teacher, but it is Jesus as God, Jesus as Resurrected Lord, that’s what puts folks off.
Of course, it is Jesus as God and Jesus as Resurrected Lord who actually saves us.
Why did and do folks have such a problem with the Resurrection?