So what you're really asking is why do people believe God made us? Because that's not what's at the top of the page, see? That's a different question altogether.
Now to answer your original question (you know, the one at the top). Most creatures are omnivores. Not all of them, but an awful lot. We can eat meat, we eat it just fine. We benefit from it, too, with protein, iron, and other goodies like that being in there. I know we can get the same benefits from vegetables and grains and legumes as well (and without all the cholesterol), but meat is there for eating, too. Animals eating animals is normal, why not humans eating animals? I think we probably are most efficient on a plant-based diet as well, but supplemented with meat. It just isn't unnatural for us to eat flesh.
As an aside (totally arguing for you here), have you noticed that animals all pretty much know what to eat when they're born? I know their parents sometimes show them what to stay away from and stuff, but they pretty much know... and we don't. I tried to eat gravel as a child! We don't know which plants are safe, we think broccoli is poisonous because it's icky, but meat, now that's something we "know" we're supposed to eat. Yeah, since when have we been able to trust that instinct?