Since the Blood of Christ has infinite merit, the Blood Jesus shed in his circumcision was sufficient to redeem all mankind. Of course, God knows all things, and so always knew that the Cross would happen. But that doesn't make crucifying an innocent man any less wrong.
He doesn't just know all things, he ordains all things.
"280 Creation is the foundation of "all God's saving plans," the "beginning of the history of salvation"117 that culminates in Christ. Conversely, the mystery of Christ casts conclusive light on the mystery of creation and reveals the end for which "in the beginning God created the heavens and the earth": from the beginning, God envisaged the glory of the new creation in Christ."
303 The witness of Scripture is unanimous that the solicitude of divine providence is concrete and immediate; God cares for all, from the least things to the great events of the world and its history. the sacred books powerfully affirm God's absolute sovereignty over the course of events: "Our God is in the heavens; he does whatever he pleases."162 and so it is with Christ, "who opens and no one shall shut, who shuts and no one opens".163 As the book of Proverbs states: "Many are the plans in the mind of a man, but it is the purpose of the LORD that will be established."164
304 And so we see the Holy Spirit, the principal author of Sacred Scripture, often attributing actions to God without mentioning any secondary causes. This is not a "primitive mode of speech", but a profound way of recalling God's primacy and absolute Lordship over history and the world,165 and so of educating his people to trust in him. the prayer of the Psalms is the great school of this trust.166
312 In time we can discover that God in his almighty providence can bring a good from the consequences of an evil, even a moral evil, caused by his creatures: "It was not you", said Joseph to his brothers, "who sent me here, but God. . . You meant evil against me; but God meant it for good, to bring it about that many people should be kept alive."178 From the greatest moral evil ever committed - the rejection and murder of God's only Son, caused by the sins of all men - God, by his grace that "abounded all the more",179 brought the greatest of goods: the glorification of Christ and our redemption. But for all that, evil never becomes a good. http://www.vatican.va/archive/ENG0015/__P19.HTM
No, it wouldn't. The sacrifice had to DIE.
He had to die to be able to conquer death itself.
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