Isaiah 45:5 states, “I am the Lord, and there is no other; There is no God besides Me.” This passage tells us there is but one God—that is, one “Godhead,” or “God Family”—but does not address the question of whether the Godhead is comprised of more than one Person. Other passages show that both the Father and the Son may be addressed with all the divine names and titles. Therefore, both are God. The two divine Persons comprise the one Godhead.

There are many Old Testament passages asserting that there is no God besides the one God. All such statements are made in view of the many “gods” acknowledged and worshiped by the nations. By saying, “There is no God besides Me,” God is saying that the so-called “gods” the heathen worship are false deities. He is not saying that the Deity (the Godhead) is restricted to only one divine Person.