You have no idea what you're talking about. The pain he endured goes beyond anything any mortal could stand. Any of us would have died from it. And I'm not talking about being nailed to a cross.
Oh my... Where in the bible does it say god can even feel pain or felt pain at this? His son was immortal... a mortal life is not even a blink of an eye for an immortal creature. I understand you interpret it to be so... But jesus existed before he came down as a mortal and will exist again as a mortal and then as an immortal forever.... I doubt in the scale of such things anyone would be upset.
It actually rather egotistical to think an immortal spirtual creature of vast powers would visit earth to save us mortal and allow us immortal life forever in happiness...