I do not believe that there is even the smallest chance that the Trinity is a “doctrinal error” simply because Jesus promised that the “gates of the netherworld” would not prevail against the Church. Furthermore, Jesus said that the Holy Spirit, the Spirit of Truth, that he would send, would lead the Church into all truth. John 16:13-15:
I put my faith in Jesus and believe with all my heart that he will not let the Church fall into error, no matter what people believe. The Holy Spirit is the soul of the Church. He is an active force in the world, yes, but He is also a person equal in majesty and glory with the Father and the Son. This is Catholic dogma.
I am not familiar with the One Volume Bible Commentary. Indeed, the word “trinity” is not found in the bible, but the
concept of one God in 3 persons is found throughout the New Testament. One example is St. Paul’s closing comment in his second letter to the Church at Corinth: “The grace of the Lord Jesus Christ and the love of God and the fellowship of the holy Spirit be with all of you.” (This is what we call a “trinitarian blessing” which is part of the introductory rite at Mass.) These are revelations by the Holy Spirit for the good of the Church. How you will respond to those revelations is guided by God’s grace. One of the wonderful things about God is that He allows us to make a choice, a characteristic which confirms His infinite love and mercy.
And Tommy, may the grace of our Lord Jesus Christ, the love of God, and the fellowship of the Holy Spirit be with you!
Brian