It seems to me that humans evolved as herbivores. I've never heard anyone argue that humans should be carnivores, but it seems like that's what you're arguing against.
1. Our teeth evolved to chew plants and veggies, true. As omnivores, we have to eat plants, not just meat. Plants are more difficult to digest, so most of our teeth resemble herbivores' teeth (chewing is the first step in digestion). Notice that we also chew meat just fine. I don't know anyone who can't chew meat because their teeth are too flat. We can even rip it right off the bone with certain teeth. Is that not an evolutionary adaptation?
My point is that just because we chew plants relatively well, that does not mean we also don't chew meat well.
2. Cooked foods kill the nutrients
Since I'm addressing the herbivore vs. omnivore argument, I'll ignore this one, as it obviously applies to plants and not meat.
3. Our digestive tract is long, apparently to process plant[s]...
Similar to #1. A long digestive tract may be necessary to process plants, but it does not preclude digesting meat.
4. Animal meat is the only food that gives us colesterol [sic].
.... which is okay in moderation. People can't survive on fruits alone, either. That doesn't mean that fruit should be eliminated from our diet.