That's why I choose to see it as an action Jesus took. I believe Jesus had the power to do whatever he wished, and to preserve himself if he so chose. He submitted to the sin of the world- to the taking of his human life- and in so doing, demonstrated God overcoming it for all people everywhere.
To me, I read about his anguish in this choice in the Garden, asking God to take that cup from him if possible, and I see that he was fully human. He did not want his bodily life to end and he did not want to have that great suffering. Yet, his willingness to submit everything to God when it was clear there could be no other way allows me to see that he was fully divine. He was entirely emptied his human self and was a pure vessel for God to fill. Because of this, he had given up all his own desires and fears, and could walk to the cross not only without sin, but also without anger, without trying to escape, without resentment. He could ask for others forgiveness, understanding deeply the human limitations that caused such horrific actions. He could ask God to forgive them "for they know not what they do."
To me, his human struggle in the Garden and full submission to God demonstrates that bridge between humanity and the Divine. Without a real human struggle, a real body to be broken, a real mind and heart to suffer as people suffer, we could always dismiss his action as something "easy" for God to do. Showing it in human terms initiates us into a gratitude that culminates in our having the Divine unveiled enough that we can begin to have a glimpse of what it was in spiritual terms- that is, the torment that was taking on the sins of the world. Without his overcoming the human struggle and being completely given over to the divinity in him, we could not see that the struggle was entirely overcome. He would be just another man who suffered and died at the hands of those in power. His resolution to be steadfast to his purpose and to pour out himself, even to take on all people's suffering and sin, and to in that moment forgive... to me, this demonstrated God's grace and love living in and through him. His resurrection demonstrated that he is a living Christ, available to us now.