“God, the blessed and only Ruler, the King of kings and Lord of lords, who alone is immortal and who lives in unapproachable light, whom no one has seen or can see. To him be honour and might forever.” (1 Timothy 6:15-16).
(Btw note Paul said that God alone is immortal. Immortal means he does not die. Anyone who believes that Jesus died cannot believe that Jesus is God. Such a belief would contradict what Paul said here. Furthermore, to say that God died is a blasphemy against God. Who would run the world if God died? Paul believed that God does not die.
Paul also said in that passage that God dwells in unapproachable light — that no one has seen God or can see him. Paul knew that many thousands of people had seen Jesus. Yet Paul said that no one has seen God, because Paul was sure that Jesus is not God. This is why Paul went on teaching that Jesus was not God, but that he was the Christ – see Acts 9:22 and 18:5)