If, for example, a Hindu says "I have faith that Vishnu is my lord and saviour", does that make Vishnu true?
Faith begins with & is worthless without; Christ as the foundation:
Hebrews 12: Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
(NOTE: Christ is the author & finisher of all faith)
It's Christ's faithful work & our faith placed in it
Rom 3:22 Even the righteousness of God which is by "faith of Jesus Christ" unto all and upon all them that believe: for there is no difference:
(NOTE: The Faith "OF" Christ)
Gal 2:16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the "faith of Christ" and not by the works of the law: for by the works of the law shall no flesh be justified.
(NOTE: It's the Faith "OF" Christ and thru the righteousness of Christ's faith. Christ becomes the Lord our righteousness. And God justifies us "Declares us Righteous in His sight)
Gal 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
Gal 3:22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe.
(NOTE: It's our Faith placed in Christ's work)
Phil 3:9 And be found in him, not having mine own righteousness, which is of the law, but "that which is through the faith of Christ", the righteousness which is of God by faith:
(NOTE: The Faith "OF" Christ)
Rom 1:17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.
Romans 5:18 Therefore as by the offence (SIN) of one (ADAM) judgment came upon all men to condemnation (DEATH) even so by the righteousness of one (JESUS) the free gift (RIGHTEOUSNESS) came upon all men unto justification of life.
Its Jesus Faith that wins the war. Adam sinned against Holy Laws. Jesus was Faithful to Holy Laws.
We access Gods Grace thru Faith (Rom 5:2) placed in Christ's finished redemptive sin atoning sacrificial work. Found in Christ's death, burial & resurrection. Then God imputes/transfers Christ's righteousness onto us & transfers/imputes our sins onto Christ. See this process in Lev 4 & Rom 4:3-8)