Sorry for the late response.
This, is mostly just a belief of mine. I'm religious, but not a church goer. I don't know if this is right or wrong. And to your first paragraph, God wouldn't have a handicap. He could have created evolution to see how it would play out, and to establish a point for how animals and people would grow.
And when you mentioned that all humans are cousins three billion times removed, I mentioned that Adam and Eve may be possible, mainly because there were other cities outside of Eden when Cain was banished.
That was a really well written argument. I admire it, but what I commented was a belief of mine, not a fact. I will however, make sure to take these into consideration next time.
Have a nice day.