Satan could have had full knowledge of Jesus’ identity without understanding the ramifications of his Sacrifice. I would have never guessed it.
And, by ramifications, I don’t mean opening the gates of Heaven. Satan didn’t care about that - it doesn’t affect him in any way. What would it matter to Satan if someone was in the Bosom of Abraham or in heaven? Either way, they’re out of his reach.
I’m talking about enabling Christian Baptism (which vanquishes original sin). And the Eucharist. And Confession. I’m talking about pouring the Grace of God upon humanity. I’m talking about the Church. NOBODY suspected that!
God had never died before, and nobody knew what would happen if he did.