Every species provides a representative. These representatives form a government.
To promote the good word of the Genitor amongst their subjects.
Literally half a galaxy's worth of assets.
They were originally founded as a scientific organization by the Ansh and Clen, roughly 450 million years ago to study a genetic anomaly that occurred in every species they found. About 250 years in, someone hypothesized that this could be the work of a species that created them all artificially. Extensive archaeological and biological research proved this. The researchers were stunned. They had just extensively proven that god exists. They threw off their scientific origins and rebranded as a religious organization. That was nearly half a billion years ago. Today, it serves as a sort of UN for over 5000 species.