Natural selection has severe logical inconsistencies.
... If we all come from the same ancestor, we would all be murderers and cannibals by the simple act of killing a cow.
That is not a logical inconsistency, it is a logical consequence. I speak as an atheist vegetarian here. You can debate if it actually is a consequence or not (if the creature is not sentient, is the killing murder?), but where is the inconsistency?
You seem to be using this brand of logic: "If x is true, then that would mean that I am a bad person, therefore x must be wrong."
Thank you for playing, better luck next time.
Another fine writeup as reply