The devil doesn't believe that Jesus' death on the cross was atonement for his sin.The devil also believe: Is he righteous? You must know that is not sufficient only to believe to be made righteous, you also must repent or sin no more.
And we are agreed. . .faith must be evidenced by obedience to Jesus commands, the first of which is to repent and believe.
But the obedience does not save, faith alone saves, and imputes the righteousness of Jesus the Christ to believers.
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