Once more: the fact that humans can't be as big or strong as certain large herbivores (or omnivores or carnivores) has NOTHING to do with our nutrition. These aforementioned animals have huge skeletal frames that require massive amounts of muscle and strength just to keep them from collapsing under their own weight, so nature has conveniently arranged for them to develop those muscles EVEN though they eat plant matter. Their hormonal outputs make it possible. A human who ate a strictly vegan diet would never grow imposing muscles UNLESS he used massive amounts of roids. Protein is NEEDED for growth (in humans and most other omnivores). Why do you think all omnivores (bears.. HUMANS!!!!!!!!!!!!!.. hogs etc) thrive on a protein rich diet? If you look at bears for example, which are very much omnivorous animals, there is a clear correlation between how much protein and fat their diets contain and how big and strong they grow. Kodiak bears, which are the largest brown bear subspecies in the world, only grow to such massive frames because their diet consists of salmon (which is an excellent source of good fats (omega 3) and protein) year round. Inland grizzlies on the other hand never reach weights that big because they eat more plant matter. And no, they aren't any healthier than their bigger and stronger coastal counterparts.
I do realize that humans are animals in a certain sense. You can NEVER disprove the fact that we have been omnivorous from the dawn of time. We haven't always eaten this much meat (it used to be more about insects and such that didn't require any preperation), but it is a scientific fact that human evolution experienced a rapid acceleration from the point where we started to consume more meat, as I stated before (especially after we invented fire and could thus cook it). Human life expectancy shot up like a rocket, population growth exploded everywhere (we could afford to have more of us around due to this new source of nutritious food), and all levels of our development started to ascend to new heights.
And one more time for the road: we aren't strict carnivores (in fact, we do rely primarily on plant based nutrition), but rather omnivores, much like chimps. They don't have claws or carnivorous jaws either, yet they regularily prey on smaller monkeys and even baboons. The argument that we don't have claws is probably the worst possible one on behalf of us being strictly vegetarian, so everyone just let it go already. I'm getting tired of repeating myself. Besides, earlier human species' used to have pointed canines, the remnants of which can still be seen in our front row of teeth. We have evolved beyond the need for natural weaponry a long time ago, so we no longer have them, or the great strength and musculature of other primates, for that matter.
Of course this is all leading us to the turf or science vs religion. A lot of christians don't believe in evolution, which would make all my arguments invalid to them. I'm not sure about all the details being correct, either, but I have different reasons to doubt the prevailing theory. Our ascension from the animal kingdom into the human kingdom might have been catalyzed by some outside force, since the 'missing link' is yet to be explained. It could have been alien intervention, or perhaps some completely different phenomena, but there is no way in this world I will subscibe to the belief that the earth (and the universe along with it, I suppose) was created in seven days by God, and that He, in his infinite wisdom, chose to make us herbivores. Wooo, then we turned from the path of light at some point, lured by Beelzebub, and started to kill our brethren (animals) for food. That shit is not gonna fly.
I have a very stong feeling of 'kinship' (or whatever you want to call it) with animals, but I don't see how it is morally corrupt for humans to do what they've been doing since the dawn of humanity: eating meat. I DO think that animals are kept in appalling conditions in slaughterhouses, and as I've said before, I would probably stop eating meat if I ever saw it first hand. However, it is natural for man to hunt (just like chimps, our closest cousins, do) and eat what he catches. Remeber that we, too, were occasionally preyed upon by certain beasts in our 'caveman' days. It was just a natural part of the cycle of life: kill or be killed, eat or be eaten.