Can it walk, talk or chew gum? Does a fetus have any sentient awareness? Can it survivie outside the womb?
First, as the child is developing in the womb, it is reliant on the nutrients supplied to it by the mother. Her diet and physical condition determine the health of the baby (assuming a full term pregnancy)
Second, after birth, the child is again reliant on either of its parents to feed and nurture it. The amount of nurturing the child gets determines whether the child lives or dies.
Third, throughout childhood, the child is dependent on the parents for basic needs. This period is when the child should be taught how to care for themself. How well the child learns to take care of themself through their teenage years and adulthood will determine if they live or die.
The one key similarity? Dependence.
Now, to wrap that up...
Your key argument is that since the fetus depends on the mother, the fetus is not human and therefore part of the mother. Since it has not yet developed "sentience" as you so define it, it is not human.
WRONG.
If we used your argument, then the fetus, the baby, and the child would not be human. If that child is born with a cognitive disorder that robs he or she of their sentience or awareness, they cease to be human. None would be human until they shed their dependency on their parents or gained/regained the "sentient awareness." For the next decade or two (or the rest of their life for that matter), the child/adult would be a "potential human".
Your argument is flawed. Your argument is emotional.
And since I am not a homeless man in San Francisco, I am not going to rifle through more of your garbage post.
Have a good morning.