I'd go with your choice, pray with him and for him, and then hand him a copy of the Institutes.
Where there's life, there's hope. 8~)
LOL. Okay, there is the good Dr. praying with this Pentecostal. The Pentecostal says, “God, thanks for the sunshine. And thank you for having absolutely no control over the human heart. After all, how could we be responsible if you dabbled inside of us. Amen.”
Dr. E looks up and says, “Son, thanks for that expression of gratefulness for God’s faithfulness about the sunshine. Sit down for the next two weeks while I teach you some really good information about the message of the Scriptures. A long time ago there was this fellow named John Calvin...”
I love it. Keep it up, Doc.