A New Testament Look at Our Old Testament Text
The crucifixion of Jesus is interpreted in a variety of ways in the New Testament and in Christian theology. One way of interpreting it is to say that God took upon himself the curse that was meant for us: Cursed is everyone who hangs on a tree. When God did not spare his own Son, but gave him up for us all, is this not good news that empowers our trust? And is not the God of the Old Testament much like the God of the New Testament in putting himself on the line?
Genesis 15 recognizes that it is sometimes hard to believe when we are in bad situations. But God addresses our bad situations with promises that ring true to our needs, just as God doubled down on the promises to Abraham and Sarah. God lives up to his relationship with us by demonstrating that his news for us is indeed good, that he is willing to risk his very self so that we might believe.