Now to him that worketh, the reward is not reckoned according to grace, but according to debt (Rom 4:4)Indeed, works done for economic or social reward do not count for salvation.
Excellent point and reference.
But to him that worketh not but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom.4:5).
The only thing counted for salvation is the faith.(Eph.2:9,Tit.3:5)
If it were of works, then God would owe something to the individual, which He doesn't, 'it is of faith, that it might be of grace' (Rom.4:16)