God cant use me... you don't know what I have done.    My husband who has ministered in many maximum security prisons has been told that several times by men who have committed some of the worst crimes. But regardless of what you or I may think of this person and what he has done, according to the Bible, God will forgive you and use your life if you repent and receive him.   Acts 9   forgiveness will god forgive me

Everyone knew Pauls's reputation.... they knew he had come to kill Christians and they didn't trust him.  They even argued with God... then waited for confirmation that this was the LORD.   After they received Saul... now Paul... the church enjoyed a time of peace and strengthing ..... They lived lives of consecration and then the church grew supernaturally.