McCulloch wrote:What consequence(s) if any would there be for Christianity if animals are indeed found to be self-aware and capable of ethical thinking?
My first impression is why not? I recall of story in the bible of a donkey arguing with a man over his unfair beating. Numbers 22 v 21-34. I would actually be fascinated to hear what the animals thought of humanity.
I can't recall where I read this next part so perhaps someone else knows, otherwise I made it up

. Some research has
potentially shown that animals are making some small types of moral decision already based on an awareness of harm to another. I think it was rhesus macaque (monkeys) that were given an option of pulling a cord for some food. They saw through a one way mirror another macaque being subjected to an electric shock each time the cord was pulled. Gradually the macaques began to starve themselves rather than get the food, if i recall correctly one animal went without food for weeks rather than cause harm to another macaque. Ironically these experiments have been done with humans without such effects, it would seem humans are far more sadistic.
McCulloch wrote:They would have to address the question, "do non-human species have eternal souls?"
I guess that depends on what your concept of what an animal soul is. For the purposes of scripture there is no direct reference to animals having souls save for one possible exception Job 12 v 10
"In whose hand is the
life of every living thing, And the breath of all mankind". The word 'life' highlighted in bold has been translated as soul / self / life / creature / person / living being... The original word is
'Nephesh', I am sure some of the Jewish debaters on here could do better with this verse than me.
McCulloch wrote:Who makes the rules for non-human species? While Christians do teach that there is a natural law, they also teach that there is a divinely revealed law. Are non-human species only under natural law, or do they also have a divinely revealed law? Do they get to endure eternal torment in an afterlife if they violate their own ethical code?
Lets be clear the 'law' of the bible is written to people, I doubt God requires all carnivores to repent of murder each time they get hungry. With regard to who makes the rules, assuming God is the designer my best guess would be ultimately God. Do they have a natural law? I guess the best way to find out is to ask them, we can infer already by behaviour some sort of social / ethical code. With regard to afterlife, the bible does not mention an afterlife for animals, I have already referenced the one possible area for an animal soul although this is only one interpretation from the word used.
McCulloch wrote:Did humanity's mythical first sin cause them to be born in sin or are they exempt from the effects of The Fall?
Scripture is not clear on this question directly either however there is one possible answer that springs to mind. It is unlikely animals are sinful since after requiring that animals can be used as a blood sacrifice for sin in the Old Testament, at least the animals involved cannot themselves be sinful. The sacrifices were described as without 'Tamiym' or blameless.
OK I did my best to find you some possible answers. To conclude I should add that the ultimate ground of what makes people special in scripture would be the concept of being made in the image of God (Genesis 1 v 26). No animal could therefore be counted as more valuable than a person. (EDIT: I should qualify however that this does not mean animals should not be valued or treated kindly, the donkey example in Numbers is sufficient to suggest we have a responsibility to value animals although how far this responsibility extends is debatable ---- cue the questions

)