Simply look to the Apostle Paul who helped murder Christians until he saw the Light, thus millions of souls walked out of darkness due to God working through Paul and God’s words in the Bible text.
Acts 9:26-28 (ESV)
“26 And when he [Saul] had come to Jerusalem, he attempted to join the disciples. And they were all afraid of him, for they did not believe that he was a disciple.
27 But Barnabas took him and brought him to the apostles and declared to them how on the road he had seen the Lord, who spoke to him, and how at Damascus he had preached boldly in the name of Jesus.
28 So he went in and out among them at Jerusalem, preaching boldly in the name of the Lord.”
I pray that he has repented. I would like to see a Barnabas type vouch for him.