The WTS says that the religious leaders of Jesus' day knew he was the Messiah but still planned to have him killed....
*** w06 1/15 pp. 11-12 The High Priest Who Condemned Jesus ***
Consider what happened when the Jewish hierarchy heard that Jesus had resurrected Lazarus. John’s Gospel reports: “The chief priests and the Pharisees gathered the Sanhedrin together and began to say: ‘What are we to do, because this man performs many signs? If we let him alone this way, they will all put faith in him, and the Romans will come and take away both our place and our nation.’” (John 11:47, 48) The Sanhedrin saw Jesus as a threat to the authority of the religious establishment and to public order, for which Pilate held them responsible. Any popular movement that the Romans might interpret as seditious could provoke their intervention in Jewish affairs—something that the Sanhedrin wanted to avoid at all costs.
Although unable to deny that Jesus performed powerful works, Caiaphas did not exercise faith but sought to maintain his prestige and authority. How could he acknowledge the raising of Lazarus? As a Sadducee, Caiaphas did not believe in the resurrection!—Acts 23:8.