A Reformed apologist for the Trinity wrote:
In Isaiah 46, Israel's God compares himself to the gods of the Babylonians. They are mere idols, but no so the true and living God of Israel. In fact, no nation has a God like Israel's. In verse 9 God says, "I am God, and there is no other; I am God, and there is no one like Me." No one like the God of Abraham, Isaac, and Jacob! No one like the God and Father of our Lord Jesus Christ! (John S. Feinberg, No One Like Him: The Doctrine of God [Wheaton, Ill.: Crossway Books, 2000], 31)
In this above passage, the author falls at the opening hurdle of his book in defense of the Trinitarian understanding of Go by presenting the One True God as a single person, and that singular person is the Father of Jesus, not “the Trinity.” As many have commented on the Trinity and those who claim that such is an essential tenet of “true, biblical Christianity,” are functionally Unitarian, not Trinitarian.
