Right, we are declared forgivcen. And we are enabled to walk in Christ's righteousness.
The problem I have is with the language of "imputation." To "inpute" does not mean to "forgive." And it does not mean to "walk in righteousness."
In my view it is not imputation of flawless righteousness that justifies us. Rather, it is simply forgiveness. Perfect righteousness was required of Christ--not of us. The only righteousness required of us is the righteousness that comes by Grace.
Of course, Christ had to qualify to bring God's forgiveness to us. In God's eyes, Christ had to be the flawless representative of His righteousness, and then suffer death at the hands of sinful men. In that way Christ could give God's righteousness to sinful men by grace through their repentance. That is not "imputation" but rather, providing a means to offer grace to men.
I agree that Christ completed the work of redemption by sacrificing himself for us. And I agree that we can, by faith, partake of God's righteousness on the basis that Christ has forgiven me. But where does this require that God "imputes" Christ's righteousness to us? He doesn't "impute it." Rather, He imparts it via Grace.
I didn't get the "imputation" part? Where does that fit in? He views us as potential recipients--not righteous by imputation. He gives His righteousness to us by Grace. He does not "impute" this righteousness to us.
The ony merit I see that we have is the choice to accept God's terms for redemption, which is to substitute Christ's righteousness for our own. His righteuosness was prepared beforehand to be displayed by Christ. And then Christ offered himself freely as an atonement for our sin so that we may partake of God's righteousness by Grace. Where is there a need for "imputation?"
The KJV uses the term "imputed" righteousness, which means "accounted" or "credited" according to other translations. Therefore, we certainly must accept the fact that righteousness is imputed to us, the same as justification is. In fact, you cannot have one without the other. If we are indeed justified (accepted) by God, then we certainly are righteous in His sight. This is the teaching of the apostle Paul in Romans and elsewhere, so rejecting it is not an option.
Rom. 4:22 says that Abraham "believed God, and it was credited to him for righteousness." So through Abraham's faith, God declared him righteous. If God had not declared him righteous, then how could Abraham be justified before the ultimate holy God? Being justified means that we must be seen as righteous because God is righteous. Therefore, "credited to him for righteousness" has to mean loved, accepted, forgiven, and justified.
Gen. 15 where Paul is quoting is a pivotal point in the idea of God's acceptance, and the reason why Paul quotes it and spends time explaining it in Rom. 4 and Gal. 3. When Jesus said (Jn. 8) "Abraham saw My day and was glad," this is what He was referring to, that when it says "Abraham believed God" he "saw" Christ's day, that is, he believed in the future coming of the Messiah. We know this by the fact that in Gal. 3:16 Paul explains that Abraham understood that God was talking about the Messiah first promised in Gen. 3:15.
I think you have a problem with thinking that acceptance by God is merited by a choice made "to accept God's terms for redemption." I see this as a problem, because the grace of God is unmerited. Unmerited grace means that justification is also unmerited. If God gives justification as a free gift, as is stated in Rom. 3:24, then justification is not merited by anything we do or choose to do.
As clearly stated in Eph. 2:8-9, getting saved is not of ourselves, but is a gift of God. A gift is not merited by anything at all, or else it's not a gift. And in v. 5 he explains exactly how the gift is not merited by anything, saying "even while we were dead in trespasses and sins, God raised us up to life and seated us in the heavenly places in Christ - by grace are we saved." So Paul says that grace is when God did something to us to create a born-again condition in our spirit, and according to James and Peter, it happened while hearing the gospel preached. Or, I imagine after hearing the gospel preached and thinking about how such a thing could be (as described by some testimonies). However, it's my understanding that if a person meditates on the gospel to believe it, they already believe it in the shadow-depth of the heart, and are merely seeking to understand it.
Faith itself is a gift from God. Whenever we are born of God, our heart is changed and renewed such that we are converted. We then no longer loathe to do God's will, but become willing to submit to Him and accept His terms for redemption. Being born again is the key (the pivot or the foundation) to living as God designed us to live. Whenever we finally, fully, and permanently accept His terms for redemption, we find from the teaching of the NT that we have indeed already been redeemed, because we have already been born of God. This is proven in 1 Jn. 5:1 which says, "Everyone who believes that Jesus is the Christ has been born of God." And one born of God is already redeemed.