What do you mean, "After his conversion, he attempted murder, denied Christ with vulgarities while Christ was being crucified, was arrogant, was a racist, and was the first legalist in the early church". You are speaking of
Peter BEFORE his conversion. No power!
After his conversion, at Pentecost, he was a changed man. He was put in jail, along with John, for preaching the name of Jesus at the gate, Beautiful. A lame man was healed and it so stirred up some people, that Peter and John were put in jail. After getting released, they went back out and preached the name of Jesus again.
Acts 3. YES,
Peter was changed after his conversion at Pentecost.
Jesus told his disciples that they would receive power AFTER that the Holy Ghost was come upon them. That they would be witnesses unto him both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Act 1:8
We still receive power AFTER that the Holy Ghost has come upon us. If we haven't receive power, could it be that the Holy Ghost hasn't come upon us! We should have power to witness, power to overcome sin, etc. IT does NOT say power to argue. But power to witness of the saving NAME of JESUS!
We must receive the Holy Ghost as the scripture hath said!
Falla39