If you do not believe Christ is one with the Father and the Holy Spirit you are not a Christian. The doctrine of the Trinity is essential to Christianity.
” The doctrine of the Trinity is essential to Christianity”
The article teacthes; “ St. Paul emphasizes, over and over again, the importance of teaching in accord with sound doctrine.”
“Trinity” is a title added to God’s Word to explain and translate the confusion between scriptures that say Heavenly Father and Jesus are one and scriptures that say Jesus is subordinate to His Father, but not part of the Father. It is a definition added to scripture.
You also say; “ If you do not believe Christ is one with the Father and the Holy Spirit you are not a Christian.”
Why was it not explained and translated that Jesus and God the Father had a plenipotentiary relationship?
By what authority has this definition Trinity been added to the Bible?
That's the established wisdom and settled doctrine with its "proof texts" that no one dare question because what kind of a nut should disagree with a couple thousand years of lockstep conformity to consensus.
Thus history repeats, which is why the actual Jesus of the Bible (the quintessential man whom God sent for everyone to emulate, follow) will be a pox on the eternal security, peace, and safety of the status quo.