Perhaps Agrippa saved Christianity when he decided not to put St. Paul to death and himself almost was converted by him to Christianity. 
In Acts 26, 27 Paul asks Herod Agrippa:
"King Agrippa, believest thou the prophets? I know that thou believest. Then Agrippa said unto Paul, Almost thou persuadest me to be a Christian. And Paul said, I would to God, that not only thou, but also all that hear me this day, were both almost, and altogether such as I am, except these bonds. And when he had thus spoken, the king rose up, and the governor, and Bernice, and they that sat with them: And when they were gone aside, they talked between themselves, saying, This man doeth nothing worthy of death or of bonds."