Witnessing to a Guy Handing out Tracts Denying God and Claiming Demons are Our Real Gods!

Street witnessing to a guy who denies God and Jesus, and who claims demons are the real Gods of this universe. He was handing out tracts spreading lies and false information stating that demons are our real gods! How do we preach the gospel and evangelize people who claim that the real Gods of this world and universe are demons? I was talking with this guy who's name is Don and I asked a lot of questions to find out his beliefs, shared the simple gospel of Jesus Christ and the reality of sin and death, and why he needed to trust in Jesus as his Lord and Saviour. When talking with people like this, atheists, and people who reject God and the gospel of Jesus Christ we need to show them grace and truth. The Bible teaches in John 3:16, Romans 1:20, Romans 3:23, Romans 6:23, Romans 10:9-13, 2 Corinthians 4:4, and other Scriptures talk about the gospel of Jesus Christ, what must I do to be saved, evidence for the existence of God, reality of sin and death, Satan the devil is a liar and false god deceiving people.