Think about it, everyone`s born good, so the brain, must be wired to be good completly. But some people turn evil during their lives, usually early in life also, so how can an entire brain, rewire itself? Exactly, it shows that the soul isn`t coming from the brain. Some children are born without a brain also, they only have the brain-stem, so if you put these two facts together, the soul is actually the brain-stem, and the brain is for something else entirely