Why did this 'hope' cause such intense opposition? The key wasn't the promise itself, but how and when Paul claimed it was fulfilled.
The central point of contention for Paul's accusers was the resurrection. The Sadducees, who denied any resurrection or spirit, were vehemently opposed. The Pharisees, however, held to the resurrection and the hope of a Messiah.
Paul's Defense
Paul identifies himself as a Pharisee, emphasizing that his stance on the resurrection—specifically, the resurrection of Jesus—was consistent with the core beliefs of the Pharisees. He was persecuted precisely because he testified that Jesus risen, and therefore, the promised Redeemer had come.