Ok, let's for a minute assume that the Creator did build the human body to last forever in perfect health. And let's assume that he prevents it from functioning that way for some reason. That doesn't make him benevolent. In fact, it makes him a really nasty bastard. I'd pass on worshipping that sort of diety.
Read the story of Adam and Eve in the garden.It's called having free will, and making the wrong choice.
Gary VanderMolen