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In whose likeness and in whose image was Seth? Surely in Adam's? God's image in which Adam was created was defaced and ruined by the Fall.

Adam was still in the godly line of the elect, and so was seth

Those in that seed line are ensured regeneration ..Thats why its relating seth back to the original creation..The image of God that adam had by creation, was subordinate to that which he would have at His regeneration..