Okay what if hypothetically that single celled organisms is God if we define God as one who created multi-cellular life, could science back this up with scientific facts as they learn more about single celled organisms?
Science so far has a good understanding of how important these organisms are to the planet to maintain it as a "living planet" and are now learning through genetics that we are not separate from them.
We don't have any other plausible ideas right now or any other evidence that would lead us in another direction.