Significance of Jesus having died for our sins, considering his godliness

I wonder what the significance is of Jesus having died for our sins, considering that he is God, or at least having known to be God's son. To me right now, that act would have been more significant if Jesus did not believe in an afterlife, let alone believe that he had a significant position in heaven. I am imagining a boss of a company, that decided to also start an internship in that same company. He then lets himself be fired from the internship in order to cover for workers in that department. In the end, he is still the boss and could start another internship, or even fire the person that fired him, or undo the firing entirely. I hope my point is clear, and hope for insight.