so what makes us living?

In class there was a question that was raised that cought my attention and it was what makes us human?
i seen a movie with Robin Williams about a robot who wanted to be Human he didnt want to live life as a machine or as someones property so he wanted to  become human. he recieved a skin upgrade to a artificial heart upgrade to having fluid like blood in his system but he was not considered human he had all the organs put into his body. he was able to smell,feel and taste but was brought up a piece of metal so is he human? does he have a soul? well see this question comes up in today's world with stuff like stem cell research and abortion with what when do we consider someone human? or what makes us human. if you check out the structure off a dead body and a human body, there exactly the same.
at bible study we were talking about how lifes before finding christ and finding god and it is said that if it isnt for god then its worth nothing also that before we found Christ in our lives we were spiritly dead. the walking dead because if you think about it people or do not believe in our lord and saviour will end up dead as fallowers of christ in the lord shall have eternal everlasting life. so technically we are all dead unless we stop our sinning and turn to God just let him take control. we all have souls but what happens to them is up to us. so when i hear a robot trying to be human or a clone consider a poor creature then i can relate to that because at one point in my life i was just spiritly dead. i was just a creature or the walking dead. what makes us human is a different conversation because you can say a clone of spem and an egg put an artificial womb or a surrogate and then born to grow up to be a donor for other beings then you wonder are they human? do they have a sould too. some people consider the embryo as when the soul starts or when it is born. but if we stop the sperm and stop the egg from ever meeting then doesnt that prevent a soul from creating? so are we killing the baby before its being created. it is all to complicated to understand even for me to comprehend. all i know is that if a person was a clone and found Christ as our savior i believe, in my opinion, that they have a better chance of entering in the kingdom then a person who is the walking dead.
God is lovely