Sinners by One Man’s Disobedience; Righteous by One Man’s Obedience
The one act of Christ was to obey, in contrast to Adam's disobedience. We don't become perfect - we still sin - but we inherit Christ's righteousness as we inherited Adam's guilt. We might think ourselves to be the worst of people, but in Christ we are considered to be the best. In Christ we have no need to fear terror.