Well, I geuss that the thing about us being made of microorganisms is a premise, but that is a proven fact. Multi-cellular organisms form from single-celled organisms working together.
I'm glad that my thoughts in the beginning of the XXI century are giving fruits.
The idea that we are an association of micro-organisms its mine, and I posted it in several forums before the first human genome map was released. (Journals and scientific institutions are ruled by a kind of inquisition, you just can't present papers debunking their silly theories, they will bury the best arguments and evidence before admitting they were dead wrong.)
I posted it against the obsolete and good for nothing theory of evolution.
And, going to your question, there is a reason, but it is not religious or philosophical, but it is purely scientific.
I think that first the theory of evolution must be officially discarded in order to show why life came to be. You see, evolutionists "steal" any new idea, discovery and evidence in order to back up their obsolete theory, and they will manipulate the given information in their favor.