[Oratam]

In the end, I think it's because Satan loves himself above everything. From the lofty perch of his angelic nature--pure spirit without a body--Satan looks down at Man as a mere animal, so very far beneath him. (We are down on earth, eating, urinating, defecating, sweating, rutting like goats, etc.)

Add to this the truth that God, who created everything, including the pure spirit nature of even the fallen angels, became MAN. THEN, that same God DIED so that Man might occupy a higher place in heaven than Satan or any of the angels.

In Satan's view, that's utterly contemptible.

(I recall in Malachy Martin's Hostage to the Devil his account of an exorcism where the fallen angel, speaking through the possessed, in its disgust for its human foes, calls them "shit canisters." That provides a pretty good idea what we look like to Satan.)

[Mrs. Don-o]

I think you nailed it. Satan hates physicality, he hates the creation of rational embodied persons, hates the Incarnation of Our Lord because of what it implies about flesh (the Word made Flesh), hates Our Lady because of her humble intimacy with the Trinity.

Christ, Son of God, Son of Mary! Save us from these bodiless entities who hate us.

[Salvation]

The deadly sin of pride is what happened to Satan. He thought he knew better than God.

What did God do? Throw him out of heaven with a third of the angels.

Dire warning that we obey God always.