When we think of beasts, we concentrate on, instead of the volumes of overwhelming similarities, that which sets us apart from them. Distinguishing characteristics. We can own them, for one. They might communicate or not, but they don’t speak any of the human languages, don’t demonstrate a huge vocabulary, and show little facility for learning languages that aren’t the ones they were born with. They aren’t big on manual dexterity and, when they make or use tools, they get by with the bare minimum. Though many of them sing or dance or both, they aren’t big on the literary arts or visual arts — but we should take into account that we look for representational elements when we don’t even share visual spectra with many of them, as we also fail to make allowances for lack of vocabulary and manual dexterity in expression. In any case, they don’t seem to tell stories, and we do like stories.
One of the places where human justice falls down is the belief, embedded in every story we tell our children from their earliest days, that bad things inevitably happen to people who are bad and that good behavior is rewarded. I’d go so far as to say that the recognition of the failure of that axiom is the source of every crisis of faith ever experienced. The innocent starve. The wicked get wealthy by cheating and stealing. Natural disasters take lives indiscriminately. We believe this unsupportable notion of the inherent fairness of the universe so strongly that when we see evidence strongly to the contrary, it is literally intolerable. We feel it as pain.
This isn’t a problem with all religions, mind. In fact, it’s only a problem with a handful. However, it’s a problem with the most popular, and the most violent — and, anthropologically speaking, the most recent. And this is the problem concept: that humans are special, are blessed, are chosen to be God’s favored children, are somehow above the animals and plants and everything else that lives, and have a God-given right of power over life and death with respect to them.
I’m not sure how all of that made it into the dominant narratives, because much of the scripture it’s based on stops well short of the worst of that in wording. But religions are made out of a huge body of traditions that, in those that do have scriptures, have very little support in those scriptures.