If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son. He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. And this is the record, that God hath given to us eternal life, and this life is in his Son. He that hath the Son hath life; and he that hath not the Son of God hath not life. (1 John 5:9-12)
In the passage above it tells us that God has testified concerning His Son [Jesus Christ] and it also tells us that God’s witness is greater than the witness of men. If God is a witness to something then you can rest assured that His testimony will be true because it is impossible for God to lie. [Romans 3:4, Hebrews 6:18] Then the passage goes on to say that those who believe on the Son of God have the witness in themselves [in their own heart] as to the truth of who JESUS CHRIST really is. The passage then tells us that those who are unbelievers have made God out to be a liar. Why? Because they do not believe the record [testimony] that God gave of His Son!
Folks that is some pretty heavy stuff when you really start to think about it. Whenever a person rejects the counsel of God, from scripture regarding salvation in Jesus Christ, what they are really doing is making God a liar. When a person utters statements such as the following. “I do not believe that Jesus Christ is the Son of God!” or “I do not believe that Jesus is the only way to Heaven!” they are telling God that He is not a truthteller. They make God out to be a liar. Have you made God out to be a liar?