How does killing anything cover anything? I mean what is it exactly about whacking an animal, a person or a god that forgives man for anything? Who made it so and why? It seems a tad uhh.. worthless. I just don't get it.
If a human did the same thing you'd all call him a weirdo.. Imagine everytime some guys son was naughty the man went out and battered a hedgehog to death. What exact mechanism has turned the beating to death of the hedgehog into forgiveness for the son? Can the father not find a better way with which to forgive his son than to squidge a harmless animal? It's simply ludicrous.. It's almost as bad as demanding that your children snip a bit of their penis off.. Why on earth would you ask such a thing? I mean surely if he didn't want that bit of skin to be there he just wouldn't have created humans with it? This god of the jews/christians is a right fucknut.
Your claim is not corroborated by the bible. If you actually read it you'll see that the only "crime" was that Cain offered fruit. In either case, why would an all-loving god get pissed off because an offering, (of which he has no need of), isn't quite good enough for him? He's like a spoilt child at christmas. Word of advice for god: Be happy with what people give you and say "thank you". It's the 'nice' way of doing things.
Humans are part of the animal kingdom. That's the way it goes - absolutely bloody regardless to your personal protests. The only way to escape that is to kill yourself and then it wont matter, (doing so is not advisable).
I would also point out the importance of not using the word "fact", because you will be called on it. Now, you claim that it's a "fact" that we have a soul. While there is actually no evidence to suggest we do, you state it's a fact and therefore clearly have those facts to show. Show them.
Have any ever told you they can't?