Humanity is going argue about where we came from.It is just never going to be an agreement. Some say that God created everything, some say that humans and all species are evolved from one another.
What is the truth, nobody knows. A little bit of both i guess.
However, as for now we have some proof for the evolution. One might be these gorillas. They look ordinary,but they already learned how to stand up straight and how to walk like that.
Here is another video of a gorilla,literally running one two legs standing up: