That's like a close friend of mine who refuses to fly, saying that if God wanted us to fly he would have given us wings instead of arms.
Sometimes He leaves some responsibility to us, and I do tend to believe that this is a constant theme in scripture.
Are you saying that God made a mistake in our anatomy and it's up to us to correct it? Having a foreskin isn't a health problem or some sort of deformity. All mammals have a prepuce.