False accusation and moving the goalposts.
I believe in the ONE TRUE GOD OF ISRAEL whom the NT clearly teaches is THREE DIVINE PERSONS.
The NT could not have taught a different God than the one taught in the Tanakh to Israel. If the New Testament had taught a different god, then it would have no more value than any Pagan mythology, and you shouldn't take it as revelation, but as an interesting or entertaining reading.
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Did Jews at the time of Jesus and his apostles believed that The God of Israel was One Agent, One Mind? Yes.
Did Jesus Christ or his apostles reject, refute or call to abandon such belief? No.
Where are the proofs?
PROOF 1. Jesus, a Jew, didn't change the belief of the Jewish scribes in the God of the Torah.
One of the teachers of the law came and heard them debating. Noticing that Jesus had given them a good answer, he asked him, “Of all the commandments, which is the most important?”
"The most important one,” answered Jesus, is this: "Hear, O Israel: The Lord our God, the Lord is one; Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.
The second is this: Love your neighbor as yourself. There is no commandment greater than these."
“Well said, teacher,” the man replied. “You are right in saying that God is one and there is no other but him. To love him with all your heart, with all your understanding and with all your strength, and to love your neighbor as yourself is more important than all burnt offerings and sacrifices.”
When Jesus saw that he had answered wisely, he said to him, “You are not far from the kingdom of God.” And from then on no one dared ask him any more questions. (Mark 12:28-34)
PROOF 2. Jesus, a Jew, didn't change the faith of his Jewish apostles in the God of Israel
Jesus said, “Do not hold on to me, for I have not yet ascended to the Father. Go instead to my brothers and tell them, ‘I am ascending to my Father and your Father, to my God and your God.’” (John 20:17)
PROOF 3. Jesus, a Jew, didn't change the faith of the Jewish crowds in the God of Israel
The people were amazed when they saw the mute speaking, the crippled made well, the lame walking and the blind seeing. And they praised the God of Israel. (Matthew 15:31)
PROOF 4. Jesus, a Jew, didn't change the faith of the Saducees in the God of Abraham
But even Moses showed in the burning bush passage that the dead are raised, when he called the Lord ‘the God of Abraham, the God of Isaac, and the God of Jacob.’ For He is not the God of the dead but of the living, for all live to Him.”
PROOF 5. Peter, a Jew, didn't change the belief of his Jewish audience in the God of Abraham, Isaac and Jacob.
Fellow Israelites, why does this surprise you? Why do you stare at us as if by our own power or godliness we had made this man walk? The God of Abraham, Isaac and Jacob, the God of our fathers, has glorified his servant Jesus." (Acts 3:12)
PROOF 6. Paul, a Jew, didn't change the faith of his Jewish and God-fearer audience in the God of his ancestors
Fellow Israelites and you Gentiles who worship God, listen to me! The God of the people of Israel chose our ancestors; he made the people prosper during their stay in Egypt; with mighty power he led them out of that country... After this, God gave them judges until the time of Samuel the prophet. Then the people asked for a king, and he gave them Saul... After removing Saul, he made David their king... From this man’s descendants God has brought to Israel the Savior Jesus, as he promised.... We tell you the good news: What God promised our ancestors he has fulfilled for us, their children, by raising up Jesus." (Acts 13: 16-33, extracts)
PROOF 7. Paul, a Jew, served the same God that his ancestors served.
I thank God, whom I serve, as my ancestors did, with a clear conscience, as night and day I constantly remember you in my prayers. (1 Tim 1:3)
PROOF 8. James, a Jew, didn't change the belief of his Christian Jewish readers in the God of the Torah, the God of Abraham
My brothers and sisters, believers in our glorious Lord Jesus Christ must not show favoritism. Show me your faith without deeds, and I will show you my faith by my deeds. You believe that there is one God. Good!... Was not our father Abraham considered righteous for what he did... And the scripture was fulfilled that says, “Abraham believed God, and it was credited to him as righteousness,” and he was called God’s friend. (James 2: 1,19, 21-23)
CONCLUSION:
The God of Israel is the one revealed in the Tanakh. Such God is treated as a "He": an individual agent, an individual mind.
This is the only God known, worshiped and preached by Jesus and his apostles.