@hairtrigger
Your argument is based on the assumption that if one Roman saw what happened everything would change. It's a weak argument though. There is no reason why others should believe what one Roman said, or even a bunch of Romans.
Don't forget it was the Jews that wanted Jesus gone at all costs, regardless of any miracles or resurrections. After Jesus' death they would have strongly denied any powers that Jesus had, otherwise it would have made them look like slayers of God's son. And they did deny everything Jesus did, and deny it to this day. No one would have wanted it to be written into history, that the man they killed had performed miracles and brought people back from death. No one would have wanted to be known as a slayer of God's son, the Romans didn't, it wasn't even their battle. It was the Christians that went out and told people what really happened. And the Romans who believed, became Christians.