Well, that comment was a bit of a mouthful, don't you think? You also didn't address, my Cosmological Argument this time, which makes me wonder what you're thinking about it. Anyway, to your argument.
"Man was created in God's image, therefore man is God."
I can see where you're getting at that. However, this isn't necessarily true. Man was created with the ability to think, to reason, to show his great morality, similar to God, just not perfect as God is. When it comes to animals, they can't do such a thing.
Imagine that we are iron over a fire. The iron will become red hot, but will never become the source, the fire. Or, for another, we are a mirror, showing God in the image. The clearer the mirror, the more of the image of God is shown.
We are nowhere near as perfect as God is. We've made mistakes, fallacies, flawed reasoning.
Ah, so there is no fixed moral code. Adolf Hitler was not wrong when he executed his "final solution." Joseph Stalin was not wrong when he starved out the Ukrainians. Murderers are not wrong when they brutally kill a man. That's fun.
God, just as he is, did not accept Cain's sacrifice. It is not explained as to why Cain killed Abel. That's why we infer that Cain was jealous that Abel had his offering accepted. If God didn't accept your offering but accepted your brother's, what would you feel? It's understandable that Cain would kill Abel out of jealousy. People have done often thought history.
I know that the universe is bound by space and time because it is merely the sum of everything that is within boundaries of space and time. I don't think I can escape time and space, can you? Can you witness the big bang and the triassic period at the same time, or be in Mexico and France in the same exact moment? I think not. A finite number plus a finite number will never equal an infinite number.
How do I know that the metaphysical doesn't bind God? Why is it my job to disprove that? You must prove that God is bound by the metaphysical, I don't have to disprove it, the same way I don't have to disprove that there's a teapot floating in space. Not being able to disprove it doesn't make it true.
I still don't think you're understanding the meaning of the story. We do not know if Cain had any sheep, but that's not at all related to the story. Cain should have given the best of his labor, not just "some grain."
According to the Bible, Cain only sacrificed some of his grain. Abel sacrificed the firstborn of his flock. So, your assumption is not exactly accurate.