1 Corinthians 8:6
“But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him.”
Paul was a unitarian, not a Trinitarian. Do Trinitarians believe he is in hell for not believing the Trinity?
As I said before: When Paul teaches his own doctrine, his own opinions, he’s a Gnostic heretic. But when he sticks with what other Christians at the time believed, he is a valuable historical witness to first century Christianity. Here, he is in perfect agreement with the speeches in Acts.