You seem genuinely ignorant of a number of facts in the Bible. The Sanhedrin put Jesus on trial for their own reasons, found him guilty and sentenced Jesus to death BUT, under Roman occupation the Jews were not allowed to carry out the death penalty, so they had to go to Pilate. Pilate didn't find Jesus guilty but was a coward, he put the matter before the crowd then present in Jerusalem as it was the custom to release 1 prisoner for Passover. The crowd chose another, and the Romans put Jesus to death.