What does the Bible say about the one true God?

The concept of the one true God is central to the Christian faith, as articulated in John 17:3, which states, "And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent." Throughout scripture, God declares His uniqueness, as seen in passages like Deuteronomy 4:39, which affirms, "the Lord, he is God in heaven above, and upon the earth beneath, there is none else." This claim stands in stark contrast to the multiple gods of pagan cultures, emphasizing God’s sovereignty and singularity as the living God who actively engages with His creation.