I agree with you. The bible should be a short book that says this is how you are saved in the Kingdom of God.
But if OSAS was the way, why tell us we must be good and warn us of all the pitfalls we may fall into. If Jesus does it all, why all the sermons by Paul to endure to the end etc., etc., etc.
Such 'salvation' is completely passive with man.
God does all the work, even the preparing of the soul, so that they will automatically and passively receive and be saved.
They are made passivists by a neutered salvation: no wars to fight, no struggles to endure, no race to run, no works to do in faith, no working out of a salvation, that they reject.
They do nothing at all. They are the do-nothings of a dead faith. Even living faith is not required. Their boast is in a Goddess of Grace that prepares it all, does it all, and finishes it all.
Any hint of works of faith and of salvation by grace is anathema to them, because it threatens their idolizing of their Goddess: all powerful Grace, that even God cannot overrule, nor His commandment can intrude upon.
It is a predetermined, prepicked, prepared, preserved, predone deal: it is all fated from the beginning and fated unto the end.
It is corruption of losing our life, and laying down our will: it is nihilism of will.
As Paul rebuked the false worship of neglect of body, so they worship their own neglect of will.
Neglect not the gift that is in thee, which was given thee by prophecy, with the laying on of the hands of the presbytery. (1 Tim4)
In the end they deny their own will even exists. There is no gift of God to neglect, because it is all God's, and none of their own. It is a pact with hell and peace with the devil (Is 28:15): the ultimate excuse of 'it's not my fault'. God cannot judge them for anything, because they don't even have a will to do anything of their own.
They cry unconditional peace and safety by the strong delusion, that comes with no conscience, because the work of the Spirit is to convict of sin, but conviction is only for repentance, and repentance is only for justification, and there is no justification with works, because it is all Grace.
Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee. (1 Tim 4)
Paul would not be allowed to enter the house, because He does not bring the doctrine of a christ of do-nothing salvation by a Grace greater than God.