You are simply logically wrong. When all your sins are put under the blood of Jesus, you have become righteous. There is no need to have someone else's righteousness imputed to you to be declared righteous by God. And you have no scripture that says you do. You are simply repeating a doctrine you were taught that the Bible teaches: a doctrine the Bible does not teach.Oh...So God imputed your sins unto Christ, but not Chris's righteousness unto you? But you need to be JUSTIFIED like Abraham was (see Romans 4). Being indwelt by the Holy Spirit is NOT sufficient for your salvation because all Christians are still sinners. No one lives in this life a perfect holy life. This is why you NEED to be justified by God with Christ's righteousness since he did for the elect what even the elect cannot do in this life. You need to be declared RIGHTEOUS by God. And if you insist that you don't need Christ's righteousness imputed to you, you will surely die in your sins.
Can you cite any verse that actually says what you are alleging?