Gibson wanted to show that satan cannot create, has never had an original idea, can only parody and ape God and God's work. So throughout this film we actually see satan in drag so to speak. satan is apeing Mary. In the Garden of Gethsemane the image from western iconography is a negative parody of "Our Lady of Grace". At first one might think "Our Lady of Sorrows" or perhaps a monk, or another apostle ... it is an arresting and confusing scene. But in the typology of the film with regard to Gibson's treatment., satan is this antitype of "Our Lady of Grace" -- Jesus Mother dressed in white radiantly triumphant in her Son's triumph and Grace, her foot crushing the serpent's head.
In this opening scene however, satan stands having told Jesus he can't succeed, he can't, he can't, he can't. satan is dressed in black not white, and instead of the snake being crushed under foot, the snake slithers out from between satan's "feet."
The genius then comes with Jesus crushing the serpent's head so that the prophecy of the Garden of Eden is joined to the Garden of Gethsemane -- just brilliant on Mel's part.
satan continues to appear in drag to mock Mary -- but the very striking image comes during the Scourgin of Christ at the pillar. The type of image seems to be a Madonna and Child image -- it reminded me of the Madonna of the Streets image -- and clearly satan is mocking Mary and Jesus by revealing the horror that satan was bringing forth out of humanity even as Mary had brought forth Jesus out of humanity.
Well, I could go on, but I think that puts it into perspective from this point of view. satan apes God, hates "Woman", goes about in drag, and is utterly defeated by the Woman's Son upon the Cross.