AMEN! I have no doubt after Peter was filled with Christ, some of those pharisees asked him,The scribes knew what Jesus was saying.
Men and brethren, what shall we do? Act.2:37
I think the testimony of the Apostles by the conduct of following Jesus was a powerful witness to unbelievers.
I think our Lord had a few rough old boys among his inner circle. To grow from trying to put a sword through someones brain to martyrdom is a great witness, but that's the testimony of Peter.