Note that in the New Testament, the Greek word for God, Theos, is singular.
My emphasis is shown in bold....
“I am the LORD your God, who brought you out of the land of Egypt, out of the house of bondage. You shall have no other gods before Me." (Exodus 20:2-3)
"Now see that I, even I, am He,
And there is no God besides Me;
I kill and I make alive;
I wound and I heal;
Nor is there any who can deliver from My hand." (Deuteronomy 32:39)
"Now therefore, O LORD our God, I pray, save us from his hand, that all the kingdoms of the earth may know that You are the LORD God, You alone." (2 Kings 19:19)
"Then you shall know that I am in the midst of Israel:
I am the LORD your God
And there is no other.My people shall never be put to shame." (Joel 2:27)
Jesus answered him, “The first of all the commandments is: ‘Hear, O Israel, the LORD our God, the LORD is one. And you shall love the LORD your God with all your heart, with all your soul, with all your mind, and with all your strength.’ This is the first commandment. And the second, like it, is this: ‘You shall love your neighbor as yourself.’ There is no other commandment greater than these.” So the scribe said to Him, “Well said, Teacher. You have spoken the truth, for there is one God, and there is no other but He." (Mark 12:29-32)
Therefore concerning the eating of things offered to idols, we know that an idol is nothing in the world, and that there is no other God but one. For even if there are so-called gods, whether in heaven or on earth (as there are many gods and many lords), yet for us there is one God, the Father, of whom are all things, and we for Him; and one Lord Jesus Christ, through whom are all things, and through whom we live. (1 Corinthians 8:4-6)
You believe that there is one God. You do well. Even the demons believe—and tremble! (James 2:19)
Now to the King eternal, immortal, invisible, the only God, be honor and glory for ever and ever. Amen. (1 Timothy 1:17 NIV)