1. That's not 4 a forth century invention. That is a codification of Jesus's fortelling, his words and acts. 2. It's the core of Christendom, Catholic and Protestant, and without it, you are not a Christian. You are Christin(ish), Christian like, Christian derived. Anyone familure with the creation of Mormonism would agree. And, as you well know, there is much more.
Because of Mormonism, and Muhammadanism, I've have quite a bit more sympathy to Jews and their complaints of evangelical proselytizing. I can see the insult.
[Sigh] Please don’t interject if you don’t understand the history and development of the Traditional Trinity. Your attempt to “read into” the Scriptures of the vastly foreign Platonic and Neo-Platonic concepts of deity that was started by the Apologists and completed by the Three Cappadocians, Tertullian, Athanasius, Augustine, and lastly Aquinas is pathetic. Your NERVE to proclaim those who refuse to accept this conflation are not “Christian” is utterly unbiblical - if so, no one before the fourth century is then a Christian.