Bellarmine, the Roman Catholic arch rival of Protestantism understood that the imputation of Christ's righteousness was the foundation for justification through faith in Christ alone. Therefore he rejected it. Unfortunately some Protestants such as N.T. Wright, Federal Vision, and certain dispensationalists are joining Bellarmine in their denials and are thereby assaulting the very foundation of justification.
Here is a paper on this important gospel topic protesting Protestants denying the gospel foundation of imputation.
