Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;
But, did not Christ declare that he himself would raise himself up from the grave (John 10:17)?  Yes, indeed; but there are hundreds of examples in the New Testament where something done by one member of the Godhead is attributed to another member of it.  The resurrection of Christ is also ascribed to the Father  (1 Corinthians 6:14;  2 Corinthians 4:14;  Ephesians 1:20), thus being ascribed to all three, the Father, the Son and the Holy Spirit.