In atonement, men made an offering to God, but Christ's sacrifice was God's offering for men. The latter is "the gift of God through our Lord Jesus Christ." Christ with His sacrifice of Himself entered into the heaven of heavens, the heavenly Holy of Holies. Atonement was made on an earthly altar. The Lord Jesus Christ offered Himself. Only the blood of animals was taken into the earthly holy of holies. But with the blood of His sacrifice of Himself, Jesus passed into the heavenly One.
"For Christ is not entered into the holy places made with hands, which are the figures of the true; but into heaven itself, now to appear in the presence of God for us: Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself." Hebrews 9:24-26
The Lord Jesus Christ laid on the altar not merely His blood, but all His Person, His entire deity and humanity. The blood shed on Calvary was the visible part of an infinite sacrifice made by God Himself.
Not all the blood of beasts,
On Jewish altars slain,
Could give the guilty conscience peace,
Or wash away the stain.
But Christ the heav'nly Lamb
Takes all our sins away,
A sacrifice of nobler name,
And richer blood than they.
John B. Champion, 1927