My hope is built on nothing less
than Jesus' blood and righteousness.
I dare not trust the sweetest frame,
but wholly lean on Jesus' name.
On Christ the solid rock I stand,
all other ground is sinking sand;
all other ground is sinking sand.
You have missed the entire concept, like so many thousands of people around the world; even if you could go back in time and take the place of Christ, your blood is not good (sinless) enough to take away the sins of the world. Christ was born not of man but of the Holy Spirit, so in His blood there was NO sin, and while He was here on earth He committed NO sin. Once the first man (Adam) sinned he transferred sin to ALL mankind. As beautiful as it sounds (giving your life in place of Christ), only Jesus Christ (Yeshua) could pay the penalty for mankind sin. Per God's Law the penalty for any sin is Death, spiritual and physical. So your blood and death would be wasted, it would not achieve anything in God's eyes.