Christians: What exactly does the soul do and where is it located?

The onus is on you to provide the evidence. That's what you FAIL to understand. If I say, when someone dies, they are dead, their brain stops working, it's the end of consciousness. Those are all objective observable claims. If you say, "oh no, no, their body dies, but their soul goes on living." That's a fantasy until you can prove it. But it's OBVIOUS that consciousness is 100% physical, if their is a soul, it is unneeded to operate the human body. Suffer severe brain damage and see if you can still pray to your God or remember your "Christian morals." It's a fact, what makes you you is physical and environmental but NOT supernatural.