"it is possible to construct a machine that is indistinguishable from people"
I disagree. Science knows very little about consciousness and free will. You can build a robot that can detect an obstacle in its path, but you cannot build a robot who is actually "self-aware" of itself. A robot will never wonder where it came from. Robots are purely material; whereas humans have an immaterial component, something that mainstream science is unable or unwilling to acknowledge.
