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If mankind AFTER the fall is in the image of Satan then to redeem mankind, Christ would have to be in the image of Satan (John 1:14; Rom 1:3; 5:12-21; Phil 2:5-8; Heb 2:14-17)

Absolutely not! That was the error of Flacius who taught that original sin (image of Satan) was part of the substance of fallen man and, therefore, it was necessary for Christ to assume original sin in order to save man. Original sin, the image of Satan, is not part of the essence of man!

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So now Jesus' essence (the second man Adam) was never in the image of God?

Absolutely not! Jesus is the very image of God being eternally begotten of the Father.