That is Christ's faith described in Rom 5:1 , not ours. We cannot justify ourselves.
You are obviously very confused and do not understand (or even know) Scripture on that subject.
Gen 15:6 - Abram believed the LORD, and he credited it to him as righteousness.
That's "HE 9God) credited it to him (Abraham).
Faith is a work, and if we believe it our work, then we remain under law and therefore judgement.
Again, you simply are unfamiliar with Scripture.
Eph 2:8,9
8 For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God—
9 not by works, so that no one can boast.
The phrases "not from yourselves" and "not by works" proves that salvation is by grace through faith. However, the faith here is the same faith as in Gen 15:6.
Rom 4:4,5
4 Now to the one who works, wages are not credited as a gift but as an obligation.
5 However, to the one who does not work but trusts God who justifies the ungodly, their faith is credited as righteousness.
v.4 says in the clearest of words that that works create a debt (obligation). Faith is not a work. v.5 proves that trusting in God (faith) is credited as righteousness.
Faith in Christ is a gift.
Here's the verse
[Rom 5:1 KJV] 1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
"through our Lord Jesus Christ": Christ's faithfulness
Your "reading" of this verse is quite off the mark.
Explain how you think a Savior saves.
Very easily. Jesus promises to give the free gift of eternal life to those who believe in Him for it.
How do you think THE Savior saves?
If you think His death is all that is needed to save people, then believing in Him has no place or no need.
In spite of the many many verses that directly tie believing in Christ to salvation.
There's a lot of the Bible that you need to re-think. Whoever taught you did not know the truth.