“The one true God”. All other gods, and there are gods, including Jesus, are not gods by their own nature but by the one true God giving them god status. God, the one true God, on the other hand, is truly God by nature. All divinity comes from Him. This is the one called the Father, by Jesus, who calls Him the one true God. (John 17:3, 1 Corinthians 8:5-6, 1 Corinthians 15:24-28)
