I am very familiar with Church history and very comfortable with the process that was used to canonize the Bible and formalize the creeds.
Origen was a great scholar of the early church. His belief on the preexistence of souls was deemed unorthodox. And he never taught half the other the nutty stuff you believe. It is news to me that Origen “denied” the Trinity. He is considered a pioneer of Trinitarian theology, being the first to speak of three hypostases in one God and the first to use the term homoousios to speak of the relation between the Father and the Son, which was later incorporated in the Nicene creed.
The stuff about spirit beings who existed since the creation of the world and were imprisoned in material bodies because of the cooling of their love, or whatever, is not found in his extant writings and certainly was not considered Christian doctrine by those who came after him. All the church fathers were fallible people and no one of them is the measuring stick for truth.