Robotic free will

Suppose advanced robot from another planet is programmed to act like
human being. If you ask him, do you feel human emotions, he is
programmed to say 'yes'. And indeed if you hit him, he shout and hit
back like human being. He is programmed to search energy, create new
robots and download updated version of software. Even some robots are
programmed to say that they believe in God and some robots are
programmed to say that they are atheist.

How can we say that they do not have any consciousness or feelings?

Those robots say that if we are programmed, then human being is also
programmed.

What proof we can give these robots that they are programmed?