Umm... very little of that made coherant sense, but I will do my best to break things down.
First, you're right that the Roman empire at the time was in control of the region. However, the Jews were allowed to continue to practise their religion and hold their own trials based on the religious laws. It was in one of these courts that they first accused Jesus of blasphemy and herecy.
The trial was completely illegal, done under the cover of night. It was all a set up to persecute Jesus for something He was not guilty of. It was also the fulfillment of prophecy, from the betrayal at Gethsemane to the exchange of coins (40 silver pieces, what one would pay for livestock) and the casting lots for His clothes at the crucifiction itself.
Now Pontius Pilate was in a position where there was another uprising within his area he would lose his position and potentially his life. Seeing no guilt in Jesus he tried to pawn the problem off onto others (Herod and such), but they do not find Jesus to be guilty of anything, either. In a last ditch attempt to difuse a potentially volitile situation, Pilate says he will release one prisoner... Jesus, who has done nothing wrong and spreads a message of peace and love, or Barabus, a murderer and a vile man. They choose Barabus, demanding Jesus be crucified. To avoid a riot, Pontius Pilate concedes. He washed his hands off the whole thing, claiming no guilt and placing the blame on those who wanted Jesus to die, and they accepted it.
You are right to say that the Roman torturers and excecutioners enjoyed inflicting pain on Jesus, but you seem to think that the Roman people are the same as Roman Catholics, which they are not. To be Roman is to orginate from Rome, the city. To be Roman Catholic is to believe in the Roman Catholic doctrine and follow their traditions. They are two very different things.
The Jews pushed for the excecution of Jesus and His blood was on their heads. The Romans are the ones who carried out the deed. Both parties played their part in fulfilling a centuries-old prophecy that culminated in bridging the gap between man and God and offering people salvation from sin.
I think that there are many things that you do not understand about the movie, the Christian faith and the Bible... and if you have any questions I would be more than happy to address them. You can post here, send me a message or email me (add me to MSN) at princessdoodlebug@hotmail.com