Humans as gods creating their machines, a lifeforce much newer than our own. As you said, a robot cannot worship, not a will of its own, and we are not those who can ever be truly served. But a god , though it cannot be seen, can be felt through sheer life force. If the life force that humans strive for continues, and eventually there emerges something that thinks for itself, we become overwhelmed by the simplicity of it all. A creation standing before its creator.
I don't believe in god. Never saw that guy show up during my life in need and despair. Maybe it is because it is a guy or I figured out I am better off on my own instead of praying, waiting, hoping for some made-up figure. To me, elves are more charming.
So all those rich. Narcissistic types who like to be an emperor or god are better off with their robots instead of humans (especially, if they rely on me or people like me).