I believe you should have led this man to Christ for salvation. Get him to the cross, burial and resurrection of our Lord. Then if he has truly turned to Jesus then there will eventually be a change in him.
We were never commissioned to change mankind, but to teach and live the life representing Jesus Christ. The Holy Spirit will do the work in him. That is the power of God.
Thanks. I’m not the author of the article. I just posted it because I found it interesting and thought others would too.
However, I do believe only the Holy Spirit can regenerate the heart of one spiritually dead per Ephesians 2:1-10
http://www.biblegateway.com/passage/?search=Ephesians%202:1-10&version=ESVUK
“And you were dead in the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience— among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind. But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved— and raised us up with him and seated us with him in the heavenly places in Christ Jesus, so that in the coming ages he might show the immeasurable riches of his grace in kindness towards us in Christ Jesus. For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.”