“Despite life’s marvels, it all dies. Why? Theologically,
because of the Fall—Adam and Eve’s sin brought death into
a perfect world.5 The biological question then is ‘How?’,
and we shall see later that the answer is ‘mutations’. “
Another strawman.
No creature needs to live forever. Just enough to propogate.
People die of cancer, sure. And serious malformation due to mutated DNA can be fatal.
But there are positive mutations of DNA. Just think MRSA. Not positive for us, but they seem happier that your average Staphylococcus aureus.
But those are just “variations”, of course. Not that evil evolution.
To say that no creature “needs” to live forever is more a theological conclusion than a biological one unless you can explain biologically why any creature, including humans, lives on past the point of their offspring's independence and their own reproductive years.
In the case of MRSA it could be just as easily argued that they kill their host too quickly and doom themselves but maybe that makes them “happy”.
What proportion of human mutations could be termed “positive”?
To make more dirt.
No dirt. No food. No life.
On the universal scale, it is the same. No star lasts forever. New stars are made from the leftovers of the deaths of old stars.