Y,know... I've spent many years examining the various proposed doctrinal formulations for F/S/HS. What I see is an INternal struggle, rather than O/rothodoxy of a DyoHypoTrin doctrine with ALL others left on the outside. (And most professing DyoHypoTrins are Triadists anyway, but that's another point all its own for another post.)
If someone is a true Monotheist who professes YHWH as that one true and living God; and also professes the Son to be the Word that literally became flesh as Jesus Christ, the biblical and historical literal man; and that Jesus Christ was born of a virgin by the Holy Spirit without an earthly father; and that by His sinless life and shed blood on calvary, He atoned for sin and brought everlasting life to those who by grace have faith in His provision for salvation, redemption, justification, and sanctification; and that there was a physical bodily resurrection and ascension after the crucifixion with Him returning in like manner... That would seem to be the "qualifying" threshhold for salvific faith rather than the minutiae of doctrinal formulation.
I'm not compromising or universalizing in any manner or to any degree. Others who claim the Logos became another created celestial being as an angel before being a created man (JW); and those insisting there is no metaphysical realm and/or that F/S/HS are a plurality of multiple gods, especially if they were men or men can attain unto deity (LDS)... are doctrinally beyond the faith, as are all the World Religions, including those who esotericize the Christian faith as "God being the One Consciousness", etc.
The Father is God, who is YHWH. Jesus Christ is His Son. The Holy Spirit indwells believers. Jesus Christ died for our sin. He rose again and ascended. He's returning (or has returned, if you're a Preterist).
This would mean that several belief systems WITHIN the Christian faith qualify. Trinitarians, Binitarians, Arians, Sabellians, Unitarians, Adoptionists and a handful of others. No Docetists, Ebionites, etc.
I don't think that's too broad. It includes all who are contending for YHWH and Monotheism, while accounting for the Son and Holy Spirit in various ways.
The Church is NOT supposed to be an institution unto itself, just like the government is NOT supposed to be an institution unto itself. The Church is the saints, not a hierarchy or corporate entity apart from the saints themselves.
Those who have DEnominated themselves are ALL in divisional schizm. Many for good reasons of earnest contention for truth, but schizm nonetheless.
Protestants don't get to claim institutional status. And it doesn't matter. The RCC and/or EOC don't get to be the "only true Church".
It's not compromise to include a small and reasonable perimeter beyond one's own adamant doctrinal formulation as elgible for salvific faith according to the Word.
Too bad there isn't as much Gospel-sharing and enemy-fighting as there is in-fighting amongst YHWH-believing Monotheists who claim the blood of Jesus Christ is the only atonement for man's sin.
My own "hostilities" are directed primarily at Dyohypostatic Trinitarians for two reasons. They are the key central proponents of historically declaring everyone else as outside the faith. And most modern professing DyoHypoTrins are functionally or literally Triadists without even knowing it OR their own historical Creedal Trinity doctrine.
My opposition is responsive, not initiative. I'd relent if they would. ALL historical formulations are wrong, by degree. Nobody can anthematize anyone else.
