You will get no argument from me that each is a significant part or component of salvation. Nor will I argue that it is beyond God's power to grant salvation for any reason. However, our shared faith has a history of covenants between God and man. These covenants were a conditional agreement or promise that required specific actions of man in order for God to keep the promise. These actions are our works of faith or the manifestation of the "solas" in our thoughts and in our words, in what we have done and what we have failed to do. That the prior Covenants were broken is not in question. I do not believe that God would unilaterally break a promise, and know that man has a history of doing just that.
The New and Everlasting Covenant is not a pact between God and mankind as were the prior Covenants. It is a conditional pact between God and each of us individually requiring works of faith and sacraments. If we keep out pact we gain Salvation, if we break it Salvation will be lost.
Wow, so you live under the Law. How's that working for you?
Hebrews 7:22 By so much was Jesus made a surety of a better testament.
23And they truly were many priests, because they were not suffered to continue by reason of death:
24But this man, because he continueth ever, hath an unchangeable priesthood.
25Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.
26For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
27Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
28For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.
Those He does not gracuiously regenerate will not want to obey God and keep His covenant.
And they are lost.