The claim that all will go straight to hell if they don't believe the totality of Christ's divine revelation to man has no teeth.. for every Christian of every church lives by a larger or lesser expression of the Christian faith as written of throughout the Bible.
It is a theological fact of Christian churchianity.. yet, everyone of them claim to have the totality of Christ's divine revelation to man. Some even add that those denominations that don't believe exactly as they do, will go straight to hell.
However, there is no verse of scripture that they might give in support of their statement that will trump the well known verses that have within them, "Believe in Jesus and you shall be saved."
That, is all that is needed for a sinner to believe. That is what makes the difference between going to heaven, or going to hell. No other doctrine matters at that point. The rest of it can be taught after salvation. And no subsequent doctrines can override the assurance of salvation.
There is no Biblical law that allows for being excommunicated by any self appointed Christian taking authority over any other Christian.
The knife to the throat as it were, to agree or die, has no supremacy within Christianity.
A Christian does not have to believe certain doctrines in order to be assured of going to heaven when they die. In that sense, once saved - always saved, is true.
The only thing that I see in this thread of forcing the issue, is a game of sorts that is being played, perhaps to snare any Christian who is weak regarding the matter of their own salvation.