Hoping that Father will correct me if I am wrong, and recognizing that this is somewhat tangential to the main topic...
I think that we should remember three points: 1) Satan could still fight and attempt victory over the incarnate Son of God. Satan is very “intelligent” in a sense, and yet stupid as he is blinded by pride. He is not omniscient. 2) Using the phrase, “if You are the Son of God” does necessarily mean that he did not believe or know Christ to be the Son of God. He was trying to tempt Jesus to prove Himself and to use His power for Himself. After all, 3) we are talking about the “father of lies.”
Anyone else directly on the main topic? This is great to read so far! I think that Father Amorth is right on and that he clearly shows why it is important to ponder and meditate on the primary motive for the Incarnation. These are not just brain games. Luadem Gloriae!
It's always sounded more of a taunt to me -- but I don't read Greek, so I don't know the original.