Believe resulting in righteousness
Righteousness only comes from being justified.

What is the key element from our account that is necessary ? Believe

What will we add to "believe in" and still have Salvation by grace alone ?

Confess
"call on the name of the Lord"
Gen 12:8 Gen 13:4 Gen 26:33
why did Abraham? To renew fellowship
Ps 116:4 Amos 9:11-12

"saved" ? Probably not, but has been already

V13 whoever shall call upon the name of the Lord will be saved
V14 How shall they call ... (if) have  not believed

Verses 13 through 15 backwards
Sent > proclaim > hear > believe > call upon the name of the Lord