You could point out to him how unsettling it is to live in God's universe and yet hate Him. Ask Him if he enjoys hating God and wants to stay that way. The answer will probably be negative. If you can, get him to cry out to God for a new heart, perhaps hypocritically at first. The act of doing so--of asking God to change him--could move him in the right direction.

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Mary Vanderkooi
Kale Heywott Church (KHC)
Soddo, Ethiopia