And I'm trying to ask a question about Unitarianism, so please refrain from attacks on my Protestant faith.
Focus on the topic at hand.
Not all Protestants believe what Luther believed. But since all forms of Protestantism exist only because of what Martin Luther and John Calvin and the other key Protestant reformers did, we may question their faith if it is not the same faith as the "faith once delivered unto the saints" (Jude 3). Not all Protestants agree with this, but Luther had doubts about James, 1 Peter, 1 John, and Revelation. We would have a shorter NT if Luther had been followed in this. Is it Protestant faith that the Spirit proceeds also "from the Son"? Sometimes, not all Protestants believe this, but MOST DO, PROBABLY. So, on the basis of Scripture, I reject this aspect of Protestantism based on John 15:26. Most Protestants get their interpretations of St. Paul from Martin Luther, John Calvin, or John Wesley, and Luther and Calvin especially got many of their wrong views from the WRONG VIEWS of AUGUSTINE OF HIPPO. Thus much of Protestantism is just AUGUSTINIAN ERROR, and not the teaching of the NT! Take care! Anyway, why would any Protestant care about Unitarianism? I was a Protestant for many years, and I was never tempted to reject the Trinity. So Unitarianism is something you and I surely reject, YES? Protestantism is good in that it ACCEPTS THE TRINITY. It is wrong if it ACCEPTS THE FILIOQUE, and falls into the Augustinian error of SEMI-SABELLIANISM.