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.