Indeed initially created without suffering. However choice is there as well, because God doesn't want robots. To exorcise true love, it must be accepted by our free will.
God gave us choice. This choice that was acted upon by free will is sin which is human will. Sin altered the world in which death entered, and now the weakest now die, or what is survival of the fittest. Human will has changed the world, and thus natural disease is a reality now. Nature is conspiring for death essentially now.
The problem I see with this is its strangeness. There is a direct correlation between placing your hand on a hot burner and withdrawing in pain: it's completely understandable why this would happen.
However, why does eating the fruit of a magic tree cause cancer, birth defects, old age, and so on? Aside from the fact that it seems a little extreme of a punishment -- and aside from the fact that the story reeks of entrapment -- how is that correlated to suffering all these maladies?
Humans aren't directly responsible for these natural bits of suffering: humans have no power to create tornadoes, cancer, disease and parasites. They had to come from somewhere, and believing in a creator god implies that they came from the god.
Let me give one of my favorite examples.
Plasmodium falciparum is the protozoan that causes the disease malaria. I understand the argument that "the Fall" caused disease and parasitism and so forth, but
Plasmodium (among other parasites) raise an interesting question because they're (assuming creation) designed
solely to be torture devices.
First, consider
P. falciparum's life cycle. An infected mosquito carries the parasite and inadvertently injects them into a human host. The parasite proceeds to burrow into eurythrocytes (red blood cells) -- why? Because hiding inside one of the body's own cells confuses the immune system, which has "feeler" cells that examine microscopic bodies. An infected eurythrocyte looks just like a normal red blood cell to the body, so the immune system leaves it alone. (By the way, this is how the life cycle continues: another mosquito comes along to imbibe some blood and picks up some infected blood cells).
However, eurythrocytes are destroyed on a regular basis when they cycle to the spleen. If this were the end of the story,
Plasmodium infections would be wiped out simply because red blood cells get destroyed. This doesn't happen, however, because
Plasmodium will emerge a hook-like structure through the membrane of the red blood cell which latches onto the walls of the vessels the eurythrocyte is traveling through (like a ninja hook). This defense is specialized specifically for human hosts.
There becomes another catch: the immune system can eventually identify these hook-like structures, destroy them, and send the infected cell on its way to the spleen for destruction.
Plasmodium has another trick up its sleeve: every few generations, the shape of the hook will change; effectively changing faster than the immune system can keep up with it.
Furthermore, the changes in the hook structures isn't random. You can separate two populations of
Plasmodium from the same host and they will go through the same sequence of hook shapes: essentially, they're drawing in sequential, non-random order from a genetic database of hook shapes with which to evade the human immune system! (Incidentally, it would be possible to cure malaria if scientists could decode this hook database and innoculate patients ahead of time with the sequence! Alas, not a lot of money is forthcoming to such projects...)
So, here we have an organism with no apparent purpose other than to specifically evade the human immune system and cause nothing but misery to humans. Why?
Again, putting a hand on a burner and retracting it in pain is understandable. But how does eating a magic fruit cause such complex specificity in a biological torture device like
Plasmodium falciparum?
The conclusion is fairly obvious to me: either God deliberately creates torture devices (if creationism is true); or as the evidence suggests, Plasmodium evolved.
Edit: There's also the interesting question of what Plasmodium would have been like before "the Fall." If everything was benign before "the Fall," how did
Plasmodium become so complex and specific to human immune systems? It certainly wasn't through blind chance!