Can you imagine anyone accusing God of lying, let alone “making God a liar”? That’s exactly what the apostle John claimed we can do. “If we say that we have not sinned, we make Him a liar, and His word is not in us” (1 John 1:10). The reason that making a claim that “we have not sinned” makes God “a liar” is because God Himself said in this very context that we will sin (1 John 1:5-2:2), and He clearly says that “all have sinned” (Rom. 3:23).
So, think about this. This applies in every situation where God has spoken. When God says something, if I say the opposite of what God says and my statement is true, then I make God a liar. But, if my statement is not true, then I am the liar.
This works in every verse of the Bible. Take one example. Jesus said, “He who believes and is baptized shall be saved” (Mark 16:16). If I say that baptism is not necessary to be saved and if my statement is true, then God is a liar. But if my statement is not true, then I am the liar. Who do you want to make a liar?