I have been critical of the doctrine of the imputation of Christ’s righteousness for the past seven years. Even when Reformed, I held it at arm’s length. I still don’t think a lot of the proof-texts for it are all that convincing. However, hints of the doctrine are there. Consider Romans 8:2: “in order that the righteous requirement of the law might be fulfilled in us,” speaking of Christ’s death.
It seems that Christ fulfilled the law and that fulfillment has something to do with our salvation. For sure, this isn’t the full imputational theology found in 19th century Southern Presbyterianism, but neither is it a wild stretch either.