Why was the resurrection such a flashpoint in ancient Jewish society, and why did Paul bring it up?
The resurrection of the dead was the absolute core of Paul's message and a major point of contention. The Pharisees, while often legalistic, believed in a future resurrection and the existence of spiritual beings. The Sadducees, however, rejected this entirely, believing only in the Pentateuch and denying any afterlife, angels, or resurrection. Paul strategically names this doctrine, 'It is with respect to the hope and the resurrection of the dead that I am on trial.' By doing so, he instantly creates a rift within the council, drawing the sympathy of the Pharisees, who shared this belief with Christians, and isolating the Sadducees.